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The increasing order of the rate of HCN ...

The increasing order of the rate of HCN addition to compound A-D is
(A) HCHO
(B) `CH_(3)COOH_(3)`
( C) `PhCOCH_(3)`
(D) `PhCOPh`

A

`A lt B lt C lt D`

B

`D lt B lt C lt A`

C

`D lt C lt B lt A`

D

`C lt D lt B lt A`

Text Solution

Verified by Experts

The correct Answer is:
C
It is a nucleophilic addition whose reactivity depends upon the electrophilic character of carbonyl carbon and steric hindrance only. So, the ease of the reaction would be `HCHO gt CH_(3)COCH_(3) gt PhCOCH_(3) gt PhCOPh.`
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