1.

In S_(N)2 reactions, the correct order of reactivity for the compounds: CH_(3)CI,CH_(3)CH_(2)CI,(CH_(3))_(2)CHCIand(CH_(3))_(3)C CI-

Answer»

`(CH_(3))_(2)CHCIgtCH_(3)CH_(2)CIgtCH_(3)CIgt(CH_(3))_(3)C CI`
`CH_(3)CIgt(CH_(3))_(2)CHCIgtCH_(3)CH_(2)CIgt(CH_(3))_(3)C CI`
`CH_(3)CIgtCH_(3)CH_(2)CIgt(CH_(3))_(3)C CI`
`CH_(3)CH_(2)CIgtCH_(3)CIgt(CH_(3))_(2)CHCIgt(CH_(3))_(3)C CI`

Solution :In case of `S_(N)2` mechanism, stric hindrance increases with INCREASE in number of bulky groups attached to the chlorinated carbon ATOM. As a RESULT, the transition state BECOMES lessleading to a very slow reaction, Hence, the order of reactively is:
`underset("methyl")(CH_(3)CI)gtunderset("primary"(1^(@)))(CH_(3)CH_(2)CI)gtunderset("secondary"(2^(@)))((CH_(3))_(2)CHCI)gtunderset("tertiary"(3^(@)))((CH_(3))_(3)C CI)`


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