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Which of the following are highly reactive towards electrophile

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Solution :A compound will be reactive towards electrophile if the benzene ring is electronrich.
In (b) and (c ) -OH group and `-NH-oversetoversetO"||"C-R` group will make the benzene ring highly ELECTRON rich due to there ability to donate their electrons inside the benzene ring hence (b) and (c ) are correct.
In (a) and (d) since `-NO_2` and -CHO are electron withdrawing groups they will push electrons from the benzene system and make it electron deficient.
Hence (a) and (d) are WRONG


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