1.

The correct increasing order of reactivity of halides for S_(N)2 reaction is

Answer»

`CH_(3)CH_(2)X LT (CH_(3))_(2)CHX lt CH_(2)=CHCH_(2)X lt PhCH_(2)X`
`(CH_(3))_(2)CHX lt CH_(3)CH_(2)X lt CH_(2)=CHCH_(2)"X lt PhCH_(2)X`
`PhCH_(2)X lt (CH_(3))_(2)CHX lt CH_(3)CH_(2)X lt CH_(2)=CHCH_(2)X`
`CH_(2)=CHCH_(2)X lt PhCH_(2)X lt (CH_(3))_(2) CHX lt CH_(3)CH_(2)X`

Answer :D


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