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Nucleophilic addition reaction will be most favoured in

1. (a) (CH3)2C=O
2. (b) CH3CH2CHO
3. (c) CH3CHO
4. (d) CH3—CH2—CH=C—CH3

Correct answer: (c) CH3CHO

Solution

Nucleophilic addition reactions are favored by compounds with less steric hindrance and stronger electrophilic carbonyl carbons. Among the options, CH3CHO (acetaldehyde) has the least steric hindrance and a highly electrophilic carbonyl carbon, making it the most reactive.

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