Question

Would Benzaldehyde will undergo aldol condensation, which the Cannizzaro reaction and which neither? Write the structures of the expected products of aldol condensation and Cannizzaro reaction.

Answer 1

HELLO DEAR,

it seems question is incomplete the complete question is------------> Which of the following compounds would undergo aldol condensation, which the Cannizzaro reaction and which neither? Write the structures of the expected products of aldol condensation or Cannizzaro reaction. 
(i) Methanal                                      
(ii) 2-methyl pentanal
(iii) Benzaldeliyde                           
(iv) Benzophenone 
(v) Cyclohexanone                         
(vi) 1-phenyl propanone 
(vii) Phenyl acetaldehyde            
(viii) Butan-1-ol 
(ix) 2,2-dimethyl butanal   

Ans. $\bold{\huge{I.}}$ (ii) 2-methyl pentanal , (v) Cyclohexanone , (vi) 1-phenyl propanone  , (vii) Phenyl acetaldehyde   contain one or more alpha- hydrogens and hence undergo $\bold{aldol\; condensation.}$ the reaction and the structure of the expected products are given in the attachment ( 1 )

$\bold{\huge{II.}}$ (i) Methanal , (iii) Benzaldeliyde  , (ix) 2,2-dimethyl butanal    do not contain Alpha hydrogen and hence undergo $\bold{Cannizzaro \; reaction.}$ the reaction and the structure of the expected products are given in the attachment ( 2 )

$\bold{\huge{III.}}$ (iv) Benzophenone having no Alpha hydrogens while (viii) Butan-1-ol is an alcohol both of these neither undergo aldol condensation nor cannizzaro reaction.

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