The major product of the following reaction is [figure]
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Answer
(4) [figure]
Solution
Excess CH3MgBr attacks both electrophilic groups.
Ketone group: CH3 adds to the carbonyl carbon alkoxide -C(OMgBr)(CH3)- H3O+ tertiary alcohol C6H5-C(OH)(CH3)-.
Nitrile group: as per NCERT, nitriles with Grignard reagent give an imine salt -C(CH3)=NMgBr (no further addition) H3O+ ketone -COCH3.
Product: C6H5C(OH)(CH3)CH2CH2COCH3 (5-hydroxy-5-phenylhexan-2-one), i.e. option (4).
Answer: (4)