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How does > C= C < differ from >C =O grou...

How does > C= C < differ from >C =O group in chemical reactions ?

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Carbonyl compounds contain `gt C = O` group, and alkenes contain `gt C = C lt` group.
(i) Carbonyl compouns undergo nucleophilic addition reactions whereas alkenes undergo electrophilic addition reactions.
(ii) On reduction carbonyl compounds first give alcohols while alkenes give alkanes.
(iii) Halogens, halogens acids and `H_(2)SO_(4)` undergo addition reactions with alkenes but not with carbonyl compounds.
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