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Grade: 12th pass
        
Which is most reactive nucleophile additiona) acetaldehyde b) benzaldehyde c)acetone d) formaldehyde
one month ago

Answers : (3)

Vikas TU
9096 Points
							
Dear student 
Aromatic carbonyl compounds are less reactive than aliphatic carbonyl groups due to steric factor. Aldehydes are more reactive towards nucleophilic additions reaction than ketones due to the following reasons :
​(i) Inductive effect
(ii) Steric reasons
The carbonyl carbon is electrophilic in nature. greater the positive charge on carbonyl carbon greater is its reactivity towards nucleophilic addition reactions. The alkyl groups exhibit +I effect. More the number of alkyl groups attached to the carbonyl carbon, lesser is the positive charge on the carbon and lesser will be its reactivity towards nucleophilic addition reaction. Also, bulkier groups hinders the approach of nucleophilic reagent, therefore, leading to a decrease in the reactivity of ketones as compared to aldehydes. 
Therefore, the increasing order of nucleophilic addition reaction is :
Benzadehyde
one month ago
Vikas TU
9096 Points
							
Dear student 
The reactivity order is 
Benzaldehyde
acetone
acetaldehyde
formaldehyde
, this is reactivity from lower to upper. 
Hope this helps 
one month ago
Ravleen Kaur
askIITians Faculty
1453 Points
							Aliphatic aldehydes are more reactive than aromatic aldehyde because of resonance the electrophilicity decreases.

Ketones are less reactive.

for> ace>Benzal>acetone
one month ago
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