Select correct statement(s) about carbene:
It is obtained by photolysis of diazomethane or ketene
It can be inserted into alkene forming cycloalkane
It can exist as singlet or triplet
All the statements are true
Select incorrect statement(s):
Electron-withdrawing inductive effect of the carbonyl group in-COOH group weakens the O-H bond and favours ionization of a carboxylic acid compared with an alcohol
Inductive effect of the chlorine destabilizes the acid and stabilizes the conjugate base
Aniline is a weaker base than ammonia
Phenol is weaker acid than water
Which group decreases acidic nature of phenol?
-CH3
-NO2
O ( (CCH3
O ( (CH
Low reactivity of vinyl chloride and chlorbenzene is due to:
Positive mesomeric effect
Negative mesomeric effect
Greater electronegativity of chlorine
Lower electronegativity of chlorine
Increasing order of the following alkyl halides for SN I
reaction is CH3CI(I), CH3 CHCH3(II), CH3)3CCI (III)
(
CI
I II III I When two double bonds are present on adjacent carbon atoms, the diene is called as:
Conjugated diene
Cumulative diene
Isolated diene
Unisolated diene
In the following reaction
+ HBr (
CH3CHCH2CH=CHCH3
(
Br
Addition is called:
2,3-addition
1,2-addition
1,4-addition
4,5-addition
Which gives more stable product?
1,2-addition
1,4-addition
Both of these
None of these
Nucleophilic addition will be maximum in:
HCHO
C6H5CHO
CH3CHO
CH3COCH3
In which peroxide effect is not observed?
HF
HCI
HI
In all cases