FIITJEE Ltd., ICES House, 29 – A, Kalu Sarai, Sarvapriya Vihar, New Delhi -110016, Ph 26515949, 26569493, Fax: 011-26513942. FIITJEE Solutions to AIEEE− 2006 CHEMISTRY PART – C 96. HBr reacts with CH2 = CH – OCH3 under anhydrous conditions at room temperature to give (1) CH3CHO and CH3Br (2) BrCH2CHO and CH3OH (3) BrCH2 – CH2 – OCH3 (4) H3C – CHBr – OCH3 Ans. (4) Sol. Electrophilic addition reaction more favourable. C H2 CH OCH3 HBr H2C CH H OCH3 Br C H3 CH Br OCH3 97. The IUPAC name of the compound shown below is Cl Br (1) 2-bromo-6-chlorocyclohex-1-ene (2) 6-bromo-2-chlorocyclohexene (3) 3-bromo-1-chlorocyclohexene (4) 1-bromo-3-chlorocyclohexene Ans. (3) 98. The increasing order of the rate of HCN addition to compounds A – D is (A) HCHO (B) CH3COCH3 (C) PhCOCH3 (D) PhCOPh (1) A < B < C < D (2) D < B < C < A (3) D < C < B < A (4) C < D < B < A Ans. (3) 99. How many moles of magnesium phosphate, Mg3(PO4)2 will contain 0.25 mole of oxygen atoms? (1) 0.02 (2) 3.125 × 10–2 (3) 1.25 × 10–2 (4) 2.5 × 10–2 Ans. (2) Sol. Mg3(PO4)2 ‘n’ moles 8n 0.25 = 0.25 n 8 = 2 25 3.125 10 8 100 − = = × × 100. According to Bohr’s theory, the angular momentum of an electron in 5th orbit is (1) h 25 π (2) h 1.0 π (3) h 10 π (4) h 2.5 π Ans. (4) Sol. nh mvr 2 = π 5h h 2.5 2 = = π π FIITJEE Ltd., ICES House, 29 – A, Kalu Sarai, Sarvapriya Vihar, New Delhi -110016, Ph 26515949, 26569493, Fax: 011-26513942. FIITJEE Solutions to AIEEE−2006 101. Which of the following molecules/ions does not contain unpaired electrons? (1) 22 O − (2) B2 (3) 2 N+ (4) O2 Ans. (1) 102. Total volume of atoms present in a face-centre cubic unit cell of a metal is (r is atomic radius) (1) 3 20 r 3 π (2) 3 24 r 3 π (3) 3 12 r 3 π (4) 3 16 r 3 π Ans. (4) Sol. 3 4 V n r 3 = × π 3 4 4 r 3 = × π 3 16 r 3 = π 103. A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will (1) remain unchanged (2) triple (3) increase by a factor of 4 (4) double Ans. (3) Sol. 2 R [W] ∝ 2 R [2CO] ′ ∝ 2 R 4[W] ∝ R 4M ∝ 104. Which of the following chemical reactions depicts the oxidizing behaviour of H2SO4? (1) 2 4 2 2 2 2HI H SO I SO 2H O + → + + (2) 2 2 4 4 2 Ca(OH) H SO CaSO 2H O + → + (3) 2 4 4 NaCl H SO NaHSO HCl + → + (4) 5 2 4 3 2 2 2PCl H SO 2POCl 2HCl SO Cl + → + + Ans. (1) 105. The IUPAC name for the complex [Co(NO2)(NH3)5]Cl2 is (1) nitrito-N-pentaamminecobalt (III) chloride (2) nitrito-N-pentaamminecobalt (II) chloride (3) pentaammine nitrito-N-cobalt (II) chloride (4) pentaammine nitrito-N-cobalt (III) chloride Ans. (4) 106. The term anomers of glucose refers to (1) isomers of glucose that differ in configurations at carbons one and four (C-1 and C-4) (2) a mixture of (D)-glucose and (L)-glucose (3) enantiomers of glucose (4) isomers of glucose that differ in configuration at carbon one (C-1) Ans. (4) FIITJEE Ltd., ICES House, 29 – A, Kalu Sarai, Sarvapriya Vihar, New Delhi -110016, Ph 26515949, 26569493, Fax: 011-26513942. FIITJEE Solutions to AIEEE−2006 107. In the transformation of 238 234 92 92 U to U, if one emission is an α-particle, what should be the other emission(s)? (1) Two β– (2) Two β– and one β+ (3) One β– and one γ (4) One β+ and one β– Ans. (1) Sol. 238 234 4 0 92 92 2 1 U U He2e− → + + 108. Phenyl magnesium bromide reacts with methanol to give (1) a mixture of anisole and Mg(OH)Br (2) a mixture of benzene and Mg(OMe)Br (3) a mixture of toluene and Mg(OH)Br (4) a mixture of phenol and Mg(Me)Br Ans. (2) 109. 3 3 CH Br Nu CH Nu Br − − + → − + The decreasing order of the rate of the above reaction with nucleophiles (Nu–) A to D is [Nu– = (A) PhO–, (B) AcO–, (C) HO–, (D) CH3O–] (1) D > C > A > B (2) D > C > B > A (3) A > B > C > D (4) B > D > C > A Ans. (1) 110. The pyrimidine bases present in DNA are (1) cytosine and adenine (2) cytosine and guanine (3) cytosine and thymine (4) cytosine and uracil Ans. (3) 111. Among the following the one that gives positive iodoform test upon reaction with I2 and NaOH is (1) CH3CH2CH(OH)CH2CH3 (2) C6H5CH2CH2OH (3) C H3 CH3OH (4) PhCHOHCH3 Ans. (4) 112. The increasing order of stability of the following free radicals is (1) 3 2 3 3 6 5 2 6 5 3 (CH ) CH (CH ) C (C H ) CH (C H ) C • • • • < < < (2) 6 5 3 6 5 2 3 3 3 2 (C H ) C (C H ) CH (CH ) C (CH ) CH • • • • < < < (3) 6 5 2 6 5 3 3 3 3 2 (C H ) CH (C H ) C (CH ) C (CH ) CH • • • • < < < (4) 3 2 3 3 6 5 3 6 5 2 (CH ) CH (CH ) C (C H ) C (C H ) CH • • • • < < < Ans. (1) 113. Uncertainty in the position of an electron (mass = 9.1 × 10–31 kg) moving with a velocity 300 ms–1, accurate upto 0.001%, will be (1) 19.2 × 10–2 m (2) 5.76 × 10–2 m (3) 1.92 × 10–2 m (4) 3.84 × 10–2 m (h = 6.63 × 10–34 Js) FIITJEE Ltd., ICES House, 29 – A, Kalu Sarai, Sarvapriya Vihar, New Delhi -110016, Ph 26515949, 26569493, Fax: 011-26513942. FIITJEE Solutions to AIEEE−2006 Ans. (3) Sol. h x. V 4 m ∆ ∆ ≥ π 34 31 h 6.63 10 x 0.001 4 m V 4 3.14 9.1 10 300 100 − − × ∆ ≥ = π ∆ × × × × × 34 31 3 6.63 10 4 3.14 9.1 3 10 10 − − − × = × × × × × = 0.01933 = 1.93 × 10–2 114. Phosphorus pentachloride dissociates as follows, in a closed reaction vessel, 5 3 2 PCl (g) PCl (g) Cl (g) + If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PCl5 is x, the partial pressure of PCl3 will be (1) x P x 1 + (2) 2x P 1 x − (3) x P x 1 − (4) x P 1 x − Ans. (1) Sol. 5 3 2 PCl (g) PCl (g) Cl (g) (1 x) x x + − PCl3 x P P 1 x = × + 115. The standard enthalpy of formation o f ( H ) ∆ at 298 K for methane, CH4(g), is –74.8 kJ mol–1. The additional information required to determine the average energy for C – H bond formation would be (1) the dissociation energy of H2 and enthalpy of sublimation of carbon (2) latent heat of vapourization of methane (3) the first four ionization energies of carbon and electron gain enthalpy of hydrogen (4) the dissociation energy of hydrogen molecule, H2 Ans. (1) 116. Among the following mixtures, dipole-dipole as the major interaction, is present in (1) benzene and ethanol (2) acetonitrile and acetone (3) KCl and water (4) benzene and carbon tetrachloride Ans. (2) 117. Fluorobenzene (C6H5F) can be synthesized in the laboratory (1) by heating phenol with HF and KF (2) from aniline by diazotisation followed by heating the diazonium salt with HBF4 (3) by direct fluorination of benzene with F2 gas (4) by reacting bromobenzene with NaF solution Ans. (2) 118. A metal, M forms chlorides in its +2 and +4 oxidation states. Which of the following statements about these chlorides is correct? (1) MCl2 is more volatile than MCl4 (2) MCl2 is more soluble in anhydrous ethanol than MCl4 (3) MCl2 is more ionic than MCl4 (4) MCl2 is more easily hydrolysed than MCl4 Ans. (3) FIITJEE Ltd., ICES House, 29 – A, Kalu Sarai, Sarvapriya Vihar, New Delhi -110016, Ph 26515949, 26569493, Fax: 011-26513942. FIITJEE Solutions to AIEEE−2006 119. Which of the following statements is true? (1) H3PO3 is a stronger acid than H2SO3 (2) In aqueous medium HF is a stronger acid than HCl (3) HClO4 is a weaker acid than HClO3 (4) HNO3 is a stronger acid than HNO2 Ans. (4) 120. The molar conductivities o o NaOAc HCl and ∧ ∧ at infinite dilution in water at 25oC are 91.0 and 426.2 S cm2/mol respectively. To calculate oHOAc, ∧ the additional value required is (1) oH O 2 ∧ (2) oKCl ∧ (3) oNaOH ∧ (4) oNaCl ∧ Ans. (4) Sol. o o o CH COONa 3 CH COO Na 3 − + λ =λ +λ ……….. (1) o o o HCl H Cl + − λ = λ +λ ………………….. (2) o o o NaCl Na Cl− λ = λ +λ …………………. (3) oCH COOH 3 (1) (2) (3) λ = + − 121. Which one of the following sets of ions represents a collection of isoelectronic species? (1) K+ , Cl–, Ca2+, Sc3+ (2) Ba2+, Sr2+, K+, S2– (3) N3–, O2–, F–, S2– (4) Li+, Na+, Mg2+, Ca2+ Ans. (1) 122. The correct order of increasing acid strength of the compounds (a) CH3CO2H (b) MeOCH2CO2H (c) CF3CO2H (d) CO2H Me Me is (1) b < d < a < c (2) d < a < c < b (3) d < a < b < c (4) a < d < c < b Ans. (3) 123. In which of the following molecules/ions are all the bonds not equal? (1) SF4 (2) SiF4 (3) XeF4 (4) 4 BF− Ans. (1) 124. What products are expected from the disproportionation reaction of hypochlorous acid? (1) HClO3 and Cl2O (2) HClO2 and HClO4 (3) HCl and Cl2O (4) HCl and HClO3 Ans. (4) 125. Nickel (Z = 28) combines with a uninegative monodentate ligand X– to form a paramagnetic complex 2 4 [NiX ] − . The number of unpaired electron(s) in the nickel and geometry of this complex ion are, respectively (1) one, tetrahedral (2) two, tetrahedral (3) one, square planar (4) two, square planar FIITJEE Ltd., ICES House, 29 – A, Kalu Sarai, Sarvapriya Vihar, New Delhi -110016, Ph 26515949, 26569493, Fax: 011-26513942. FIITJEE Solutions to AIEEE−2006 Ans. (2) Sol. 28Ni: ………. 3s2, 3p6, 3d8, 4s2 Ni2+: 3s2, 3p6, 3d8 3d 4s 4p 3 sp Tetrahedral geometry 126. In Fe(CO)5, the Fe – C bond possesses (1) π-character only (2) both σ and π characters (3) ionic character (4) σ-character only Ans. (2) 127. The increasing order of the first ionization enthalpies of the elements B, P, S and F (lowest first) is (1) F < S < P < B (2) P < S < B < F (3) B < P < S < F (4) B < S < P < F Ans. (4) 128. An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If Ti is the initial temperature and Tf is the final temperature, which of the following statements is correct? (1) (Tf)irrev > (Tf)rev (2) Tf > Ti for reversible process but Tf = Ti for irreversible process (3) (Tf)rev = (Tf)irrev (4) Tf = Ti for both reversible and irreversible processes Ans. (1) 129. In Langmuir’s model of adsorption of a gas on a solid surface (1) the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered (2) the adsorption at a single site on the surface may involve multiple molecules at the same time (3) the mass of gas striking a given area of surface is proportional to the pressure of the gas (4) the mass of gas striking a given area of surface is independent of the pressure of the gas Ans. (3) 130. Rate of a reaction can be expressed by Arrhenius equation as: E /RT k Ae− = In this equation, E represents (1) the energy above which all the colliding molecules will react (2) the energy below which colliding molecules will not react (3) the total energy of the reacting molecules at a temperature, T (4) the fraction of molecules with energy greater than the activation energy of the reaction Ans. (2) FIITJEE Ltd., ICES House, 29 – A, Kalu Sarai, Sarvapriya Vihar, New Delhi -110016, Ph 26515949, 26569493, Fax: 011-26513942. FIITJEE Solutions to AIEEE−2006 131. The structure of the major product formed in the following reaction I Cl NaCN DMF → is (1) CN CN (2) I Cl NC (3) CN Cl (4) I CN Ans. (4) 132. Reaction of trans-2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces (1) 4-phenylcyclopentene (2) 2-phenylcyclopentene (3) 1-phenylcyclopentene (4) 3-phenylcyclopentene Ans. (4) Sol. According to E2 mechanism. 133. Increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of 2-fluoroethanol is (1) Eclipse, Gauche, Anti (2) Gauche, Eclipse, Anti (3) Eclipse, Anti, Gauche (4) Anti, Gauche, Eclipse Ans. (3) 134. The structure of the compound that gives a tribromo derivative on treatment with bromine water is (1) CH3 OH (2) CH2OH (3) CH3 OH (4) CH3 OH Ans. (1) 135. The decreasing values of bond angles from NH3 (106o) to SbH3 (101o) down group-15 of the periodic table is due to (1) increasing bp-bp repulsion (2) increasing p-orbital character in sp3 (3) decreasing lp-bp repulsion (4) decreasing electronegativity Ans. (4) FIITJEE Ltd., ICES House, 29 – A, Kalu Sarai, Sarvapriya Vihar, New Delhi -110016, Ph 26515949, 26569493, Fax: 011-26513942. FIITJEE Solutions to AIEEE−2006 136. Me N Et Me n-Bu ∆ → OH The alkene formed as a major product in the above elimination reaction is (1) Me (2) CH2 = CH2 (3) Me (4) Me Ans. (2) 137. The “spin-only” magnetic moment [in units of Bohr magneton, B ( )] µ of Ni2+ in aqueous solution would be (Atomic number of Ni = 28) (1) 2.84 (2) 4.90 (3) 0 (4) 1.73 Ans. (1) 138. The equilibrium constant for the reaction 3 2 2 1 SO (g) SO (g) O (g) 2 + is Kc = 4.9 × 10–2. The value of Kc for the reaction 2 2 3 2SO (g) O (g) 2SO (g) + will be (1) 416 (2) 2.40 × 10–3 (3) 9.8 × 10–2 (4) 4.9 × 10–2 Ans. (1) Sol. 2 c 2 1 K 4.9 10− ′ = × 4 10 100 100 4.9 4.9 24.01 × = = × = 4.1649 × 100 = 416.49 139. Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture? (1) The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group (2) In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group (3) Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens (4) In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group Ans. (4) FIITJEE Ltd., ICES House, 29 – A, Kalu Sarai, Sarvapriya Vihar, New Delhi -110016, Ph 26515949, 26569493, Fax: 011-26513942. FIITJEE Solutions to AIEEE−2006 140. Given the data at 25oC, o Ag I AgI e ; E 0.152 V − − + → + = o Ag Ag e ; E 0.800 V + − → + =− What is the value of log Ksp for AgI? RT 2.303 0.059 V F = (1) –8.12 (2) +8.612 (3) –37.83 (4) –16.13 Ans. (4) Sol. o AgI(s) e Ag(s) I ; E 0.152 − − + + = − o Ag(s) Ag e ; E 0.8 + − → + =− o AgI(s) Ag I ; E 0.952 + − → + =− ocell 0.059 E logK n = sp 0.059 0.952 log K 1 − = sp 0.952 log K 16.135 0.059 = − = − 141. The following mechanism has been proposed for the reaction of NO with Br2 to form NOBr: 2 2 NO(g) Br (g) NOBr (g) + 2 NOBr (g) NO(g) 2NOBr(g) + → If the second step is the rate determining step, the order of the reaction with respect to NO(g) is (1) 1 (2) 0 (3) 3 (4) 2 Ans. (4) Sol. 2 2 NO(g) Br (g) NOBr (g) + 2 NOBr (g) NO(g) 2NOBr(g) + → 2 R K[NOBr ] [NO] = 2 c 2 c 2 [NOBr ] K.K [NO] [Br ][NO], where K [NO] [Br ] = = 2 2 K [NO] [Br ] ′ = 142. Lanthanoid contraction is caused due to (1) the appreciable shielding on outer electrons by 4f electrons from the nuclear charge (2) the appreciable shielding on outer electrons by 5d electrons from the nuclear charge (3) the same effective nuclear charge from Ce to Lu (4) the imperfect shielding on outer electrons by 4f electrons from the nuclear charge Ans. (4) 143. Resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.1 M is 100 . Ω The conductivity of this solution is 1.29 S m–1. Resistance of the same cell when filled with 0.2 M of the same solution is 520 . Ω The molar conductivity of 0.02 M solution of the electrolyte will be (1) 124 × 10–4 S m2 mol–1 (2) 1240 × 10–4 S m2 mol–1 (3) 1.24 × 10–4 S m2 mol–1 (4) 12.4 × 10–4 S m2 mol–1 FIITJEE Ltd., ICES House, 29 – A, Kalu Sarai, Sarvapriya Vihar, New Delhi -110016, Ph 26515949, 26569493, Fax: 011-26513942. FIITJEE Solutions to AIEEE−2006 Ans. (4) Sol. There is one mistake in Question paper. Assuming concentration of solution is 0.2 M instead of 0.02 M. Since resistance of 0.2 M is 520 . Ω R = 100 Ω 1 K R a = 1 1.29 100 a = 1 129 m a − = R 520 = Ω, C = 0.2 M ( ) 1 1 1 1 K 129 m R a 520 − − = = Ω 3 in cm K V µ = × 6 3 1 1000 129 10 m 520 0.2 − = × × × 6 129 1000 10 520 0.2 − = × × 3 1.24 10− = × 4 12.4 10− = × 144. The ionic mobility of alkali metal ions in aqueous solution is maximum for (1) K+ (2) Rb+ (3) Li+ (4) Na+ Ans. (2) 145. Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is (1) 1.14 mol kg–1 (2) 3.28 mol kg–1 (3) 2.28 mol kg–1 (4) 0.44 mol kg–1 Ans. (3) 146. The enthalpy changes for the following processes are listed below: Cl2(g) = 2Cl(g), 242.3 kJ mol–1 I2(g) = 2I(g), 151.0 kJ mol–1 ICl(g) = I(g) + Cl(g), 211.3 kJ mol–1 I2(s) = I2(g), 62.76 kJ mol–1 Given that the standard states for iodine and chlorine are I2(s) and Cl2(g), the standard enthalpy of formation for ICl(g) is (1) –14.6 kJ mol–1 (2) –16.8 kJ mol–1 (3) +16.8 kJ mol–1 (4) +244.8 kJ mol–1 Ans. (3) Sol. 2 2 1 1 I (s) Cl ICl(g) 2 2+ → [ ] I (s) I (g) I I Cl Cl I Cl 2 2 1 1 1 H H 2 2 2 → − − − ∆ = ∆ + µ + µ − µ ( ) 1 1 1 62.76 151.0 242.3 211.3 2 2 2 = × + × + × − = 228.03 – 211.3 H ∆ = 16.73 147. How many EDTA (ethylenediaminetetraacetic acid) molecules are required to make an octahedral complex with a Ca2+ ion? (1) Six (2) Three (3) One (4) Two Ans. (3) FIITJEE Ltd., ICES House, 29 – A, Kalu Sarai, Sarvapriya Vihar, New Delhi -110016, Ph 26515949, 26569493, Fax: 011-26513942. FIITJEE Solutions to AIEEE−2006 148. OH 3 CHCl NaOH + + → O Na CHO The electrophile involved in the above reaction is (1) 2 dichloromethyl cation (CHCl ) (2) dichlorocarbene 2 ( CCl ) : (3) 3 trichloromethyl anion (CCl ) (4) formyl cation (CHO) Ans. (2) 149. 18 g of glucose (C6H12O6) is added to 178.2 g of water. The vapour pressure of water for this aqueous solution at 100oC is (1) 759.00 Torr (2) 7.60 Torr (3) 76.00 Torr (4) 752.40 Torr Ans. (4) Sol. o s s P P n P N − = s s 18 1 760 P 0.1 180 10 178.2 P 9.9 9.9 18 − = = = s s 1 760 P P 99 − = 760 × 99 – Ps × 99 = Ps 760 × 99 = 100 Ps s 760 99 P 752.4 100 × = = 150. ( H U) ∆ − ∆ for the formation of carbon monoxide (CO) from its elements at 298 K is (R = 8.314 J K–1 mol–1) (1) –1238.78 J mol–1 (2) 1238.78 J mol–1 (3) –2477.57 J mol–1 (4) 2477.57 J mol–1 Ans. (1) Sol. g H U nRT ∆ − ∆ = ∆ 1 8.314 298 2 = − × × = –1238.78