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The increasing order of the rate of `HCN` addition of compound a-d is
(i) `HCHO`
(ii) `CH_(3)COCH_(3)`
(iii) `PhCOCH_(3)`
(iv) `PhCOPh`
A. `(i) lt (ii) lt (iii) lt (iv)`
B. `(iv) lt (ii) lt (iii) lt (i)`
C. `(iv) lt (iii) lt (ii) lt (i)`
D. `(iii) lt (iv) lt (ii) lt (i)`

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Correct Answer - C
Addition of HCN is a nucleophilic addition reaction. Greater the electron deficiency of carbonyl group, higher the rate of reaction.
Hence, `Ph-overset(O)overset(||)C-PhltPh-overset(O)overset(||)C-CH_(3)ltCH_(3)-overset(O)overset(||)C-CH_(3)`

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