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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 ltC lt D`

B

`D lt B ltC lt A`

C

`D ltC lt B lt A`

D

`Clt D lt B lt A`

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