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Identify the electrophile center in the ...

Identify the electrophile center in the following :
(i) `CH_(3)CHO" "`(ii) `CH_(3)CH=CH_(2)" "`(iii) `CH_(3)COCH_(3)`

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Electrophile centre is the one which develops a partial positive charge when nuclephile attacks. It is shown by the sign `(**)`. For example,
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