(a) Account for the following :
(i) `Cl-CH_(2)COOH` is a stronger acid than `CH_(3)COOH`
(ii) Carboxylic acids do not give reaction of carbonyl group
(b) write the chemical equation to illustrate the following name reactions:
(i) Rosenmund reduction
(ii) Cannizzaro 's reaction
(C ) Out of `CH_(3)CH_(2)-CO-CH_(2)-CH_(3)` and `CH_(3)CH_(2)-CH_(2)-CO-CH_(3)` which gives iodoform test?

Explanation

(a)(i) Due to presence of -CI as a -I group which make carboxylate ion more stable
(ii) The carbonly group is invole in resonance in -COOH group do not give reaction of carbonyl grop althogh it have gt C=O .As electro philic character of carboxy carbon is reduced
(b)(i) `CH_(3)-COCI+H_(2)overset(Pd)underset(BaSO_(4))rarrCH_(3)CHO+HCI`
(ii) Cannizzaro reaction : Aldehydes which do not contain an ahydrogen atom when treated with concentrated alkali solution undergo self oxidation reduction .As a result one mlecule of the aldehyde is reduced to the corresponding alcohol which is oxidised to the corresponding carboxylic acid .This reaction is called cannizzaro reaction .
`2C_(6)H_(5)CHO+NaOHrarrC_(6)H_(5)CH_(2)OH+C_(6)H_(5)COONa`
(c ) `CH_(3)CH_(2)CH_(2)COCH`