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The increasing order of the rate of HCN addition to compound A – D is a. HCHO b. CH base 3COCH base 3 c. phCOCH base 3 d. phCOPh (a) D b. C c. A d/ D

The increasing order of the rate of HCN addition to compound A – D is
a. HCHO
b. CH base 3COCH base 3
c. phCOCH base 3
d. phCOPh
(a) D < C < B < A
b. C < D < b < A
c. A < B < C < D
d/ D < B < C < A

Grade:12th pass

1 Answers

Kevin Nash
askIITians Faculty 332 Points
7 years ago

(a) NOTE : Addition of HCN to carbonyl compounds is nucleophilic addition reaction. The order of reactivity of carbonyl compounds is

Aldehydes (smaller to higher) Ketones (smaller to higher), Then

HCHO > CH base 3COCH base 3 > Ph.COCH base 3 > PhCOPh

NOTE : The lower reactivity of Ketones is due to presence of two alkyl group which shows +1 effect. The reactivity oof Ketones decreases as the size of alkyl group increases.

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