1.

The increasing order of the rate of HCN addition to compound A-D is (A)HCHO , (B)CH_3COCH_3 , (C ) PhCOCH_3 , (D)PhCOPh

Answer»

D lt Clt Blt A
C lt D lt B lt A
A lt Blt C lt D
D lt B lt C lt A

Solution :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 gt CH_3COCH_3 gt PhCOCH_3 gt PhCOPh`
The lower reactivity of ketones is due to presence of two ALKYL group which shows +I effect. The reactivity of ketones decreases as the size of alkyl group increases.


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