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Give reasons : (i) The alpha-hydrogen atoms of aldehydes and ketones are acidic in nature. (ii) Propanone is less reactive than ethanal towards addition of HCN. (iii) Benzoic acid does not give Friedel-Crafts reaction. |
Answer» Solution :(i)  Oxygen being more electronegative than carbon draws the electrons towards it making carbon positive. Carbon, in turn, draws the electrons. (ii) Propanone is less reactive than ETHANAL towards addition of HCN. `CH_(3)-overset(O)overset(||)C-CH_(3), CH_(3)-overset(O)overset(||)C-H` This is because the nucleophile CIST FACES steric hindrance while attaching to propanone. (in) Benzoic acid does not give Friedel-Crafts reaction. This is because — COOH group is deactivating and the ALUMINIUM chloride (Lewis acid) gets bonded to the CARBOXYL group |
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