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  • Give reasons for the following : (a) Aldehydes  are more reactive than ketones <img alt="(R-CO-R)" src="https://entrancecorner.cod

Give reasons for the following :

(a) Aldehydes (R-CHO) are more reactive than ketones (R-CO-R) towards nucleophilic addition reaction.

(b) Benzaldehyde does not undergo aldol condensation reaction.

(c) Benzoic acid does not give Fridal-Crafts reaction.

 

 

 

 
 
 
 
 

Answers (1)

(i) Aldehydes are more reactive towards nucleophilic addition reaction than ketones because-

(a) Due to electron releasing effectb of alkyl group the electrophillicity of carbonyl carbon decreases since ketones contains two alkyl groups therefore they are less reactive.

(b) Carbonyl carbon in ketons is more sterically hindered due to presence of two bulkier alkyl groups making nucleophillic attack difficult.

(ii) Benzaldehyde does not gives aldol condensation reaction because it does not contains \alpha -hydrogen atom which is lost during the reaction .

(iii) Benzoic acid does not gives fridel-crafts reactions due to deactivating nature of -COOH group and the catalyst AlCl_{3} gets bonded to -COOH group.

Posted by

Sumit Saini

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