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Solution


Q.

Which among the following aldehydes is most reactive towards nucleophilic addition reactions                  [2024]
1  
2  
3  
4  

Ans.

(2)

Reactivity of aldehydes and ketones is more in nucleophilic addition reactions if:

(i) Partial positive charge on carbonyl carbon is more, Nu- is attracted more and hence more is reactivity.

(ii) Lesser is crowding around carbonyl carbon, easier is it for Nu- to approach, hence more is reactivity.

Presence of alkyl groups around carbonyl carbon decreases partial positive charge of the carbonyl carbon due to +I effect of alkyl groups. Also, bulky alkyl groups hinder attack of Nu- on carbonyl carbon. Hence presence of alkyl groups around carbonyl carbon decreases reactivity of aldehydes/ketones towards nucleophilic addition.