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InterviewSolution
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2Give reasons:(i) Propanone i(i) Benzoic acid does not give Friedal Crafs reaction.The a-hydrogen atoms of aldehydes and ketones are acidic in nature.anone is less reactive than ethanol toward addition of HCN. |
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Answer» 1)Alpha hydrogen is nothing but the hydrogen atom attached to the alpha carbon atom,which in turn is attached to the carbonyl carbon. After removal of alpha hydrogen atom, conjugated base so obtained is resonance stabilised. Hence alpha hydrogen atoms in aldehydes and ketones are acidic in nature. 2) 3)In Benzoic acid there is -COOH group on benzene which is meta directing in nature. All the metadirecting groups exert strong -I along with the -M effect which decrease the electron density from the benzene ring and make it less reactive for friedel crafts reaction. |
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