MCQ ON CARBOXYLIC ACID & THEIR DERIVATIVES

Ethyl ester. The product P will be [IIT-JEE 2003] (a) (b) (c) (d) Hydrogenation of over catalyst in methanol gives [Roorkee Qualifying 1998] (a) (b) (c) (d) Which of the following has the most acidic proton [Roorkee Qualifying 1998] (a) (b) (c) (d) In the anion the two carbon-oxygen bonds are found to be of equal length. What is the reason for it (a) Electronic orbitals of carbon atom are hybridised (b) The C = O bond is weaker than the C – O bond (c) The anion has two resonating structures (d) The anion is obtained by removal of a proton form the acid molecule An organic compound of molecular formula does not react with sodium. With excess of it gives only one type of alkyl halide. The compound is [SCRA 2001] (a) Ethoxyethane (b) 2-Methoxypropane (c) 1-Methoxypropane (d) 1-Butanol When is reduced with , the compound obtained will be [AIEEE 2003] (a) (b) (c) (d) In a set of the given reactions, acetic acid yielded a product C . Product C would be [CBSE PMT 2003] (a) (b) (c) (d) Carboxylic acids are more acidic than phenol and alcohol because of [Tamil Nadu CET 2001] (a) Intermolecular hydrogen bonding (b) Formation of dimers (c) Highly acidic hydrogen (d) Resonance stabilization of their conjugate base can be converted into The correct sequence of the reagents is [AIIMS 1997] (a) (b) (c) (d) When propionic acid is treated with aqueous sodium bicarbonate is liberated. The ‘C’ of comes from [IIT-JEE (Screening) 1999] (a) Methyl group (b) Carboxylic acid group (c) Methylene group (d) Bicarbonate Benzoyl chloride is prepared from benzoic acid by [IIT-JEE (Screening) 2000] (a) (b) (c) (d) Identify the correct order of boiling points of the following compounds ,, [IIT-JEE (Screening) 2002] (a) (b) (c) (d) The compound not soluble in acetic acid is [UPSEAT 2003; IIT-JEE 1986] (a) (b) (c) (d) The ortho/para directing group among the following is [AIIMS 2003] (a) (b) (c) (d) Iodoform test is not given by [BHU 1995] (a) Acetone (b) Ethyl alcohol (c) Acetic acid (d) None of these How will you convert butan-2-one to propanoic acid [IIT-JEE (Screening) 2005] (a) Tollen’s reagent (b) Fehling’s solution (c) (d) Which of the acids cannot be prepared by Grignard reagent [MH CET 2004] (a) Acetic acid (b) Succinic acid (c) Formic acid (d) All of these Which of the following is the weakest acid [CPMT 2001] (a) (b) (c) (d) Pyruvic acid is obtained by [AFMC 1995] (a) Oxidation of acetaldehyde cyanohydrin (b) Oxidation of acetone cyanohydrin (c) Oxidation of formaldehyde cyanohydrin (d) None of these The product obtained by dry distillation of calcium formate on reacting with ammonia yields (a) Formamide (b) Acetamide (c) Acetaldehyde ammonia (d) Urotropine In the reaction The compound X is [Roorkee Qualifying 1998] (a) Phthalic anhydride (b) Phthalic acid (c) o-xylene (d) Benzoic acid Ethyl acetate reacts with to form [MP PET 1999] (a) Secondary alcohol (b) Tertiary alcohol (c) Primary alcohol and acid (d) Acid In quick vinegar process of acetic acid, the temperature of mixture is [RPMT 2003] (a) 300 K (b) 427 K (c) 500 K (d) 350 K Formic acid can reduce [CPMT 1987] (a) Tollen's reagent (b) Mercuric chloride (c) (d) All of these 0.2 gm of fine animal charcoal is mixed with half litre of acetic acid solution and shaken for 30 minutes [BHU 1998] (a) The concentration of the solution decreases (b) Concentration increases (c) Concentration remains same (d) None of these Dimerisation in carboxylic acid is due to [KCET 2002] (a) Ionic bond (b) Covalent bond (c) Coordinate bond (d) Intermolcular hydrogen bond A colourless organic compound gives brisk effervescences with a mixture of sodium nitrite and dil. HCl. It could be [CPMT 1978] (a) Glucose (b) Oxalic acid (c) Urea (d) Benzoic acid What is formed when benzoyl chloride reacts with aniline in presence of sodium hydroxide [BHU 1996] (a) Acetanilide (b) Benzanilide (c) Benzoic acid (d) Azobenzene Strong acid among the following is [CBSE PMT 1992; AFMC 1998; BHU 2000] (a) (b) (c) (d) Aspirin is obtained by the reaction of salicylic acid with [AFMC 1998] (a) Acetone (b) Acetaldehyde (c) Acetyl chloride (d) Acetic anhydride Oxalic acid when reduced with zinc and gives [Tamil Nadu CET 2001] (a) Glyoxallic acid (b) Glyoxal (c) Glycollic acid (d) Glycol A distinctive and characteristic functional group in fats is [NCERT 1981; MP PET 1995] (a) A ketonic group (b) An ester group (c) A peptide group (d) An alcoholic group Which substance will give amide when heated with [CPMT 1997] (a) Potassium (b) Hydrogen (c) Ethane (d) Nitrogen Which acid has least value [CPMT 1982] (a) (b) (c) (d) 1. (a) 2. (b) 3. (d) So most acidic in nature. 4. (c) Anion has two resonating structure (identical). 5. (a) Since a single alkyl halide is formed on treatment with HI, it must be a symmetrical ether i.e., ethoxyethane. 6. (b) 7. (a) 8. (d) Resonance stabilization of their conjugate base i.e., carboxylate ion. 9. (a) 10. (d) 11. (c) 12. (b) –COOH and –OH group form the hydrogen bond by which they have high boiling point. –COOH group show strong hydrogen bonding so it form dimer and have more boiling point than –OH group. While –CHO group do not form hydrogen bond. Thus the reactivity order are as 3 > 1 > 2. 13. (c) is a salt of oxalic acid which is more acidic than acetic acid, so it is insoluble in acetic acid. 14. (d) –COOH and are meta directing group due to the presence of , similarly CN is also meta directing due to the presence of multiple bond while is ortho/para directing group because of less electron density over group. 15. (c) Iodoform test is given by all the compounds having or group. 16. (c) 17. (c) Formic acid can not be prepared by grignard’s reagent. Higher acids are prepared by the reaction of on grignard’s reagent 18. (a) Phenol is a weaker acid than carboxylic acids. 19. (a) 20. (d) 21. (a) 22. (b) 23. (a) 24. (d) Tollen’s reagent - Fehling solution – Mercury chloride – 25. (a) Activated charcoal adsorbed the impurity of acetic acid by which the concentration of acetic acid solution decrease. 26. (d) Intermolecular hydrogen bonding leads to dimerisation of carboxylic acid in non-aqueous solvents. 27. (c) evolve with brisk effervescence. 28. (b) It is known as Schotten Baumann reaction. 29. (a) Due to –I effect of three F atom is a strong acid. 30. (d) 31. (c) 32. (b) Fat is the ester of higher acids & glycerol. 33. (a) 34. (a) Trichloroacetic acid has least pka value and is most acidic. CARBOXYLIC ACID & THEIR DERIVATIVES Mrs. SHALLU JINDAL AGGARWAL : (M)9878608983 + CH3COOH Aspirin or Acetyl salicylic acid OCOCH3 COOH ( + (CH3CO)2O Acetic anhydride Salicylic acid OH COOH COOH CONH2 O O || C C || O +NH3 COOH COOH COOH OH Benzoyl chloride Benzoic acid COCl COOH H CHOHCOOH + 3H2 CHOHCOOH CH3