1.

In S_(N)2 reactions, the correct order of reactivity for the following compounds : CH_(3)Cl,CH_(3)CH_(2)Cl,(CH_(3))_(2)CHCland(CH_(3))_(3)C Cl is :

Answer»

`CH_(3)Clgt(CH_(3))_(2)CHClgtCH_(3)CH_(2)Clgt(CH_(3))_(3)C Cl`
`CH_(3)ClgtCH_(3)CH_(2)Clgt(CH_(3))_(2)CHClgt(CH_(3))_(3)C Cl`
`CH_(3)CH_(2)ClgtCH_(3)Clgt(CH_(3))_(2)CHClgt(CH_(3))_(3)C Cl`
`(CH_(3))_(2)CHClgtCH_(3)CH_(2)ClgtCH_(3)Clgt(CH_(3))_(3)C Cl`

Solution :Rate of `S_(N)2` REACTION depends on stearic crowding of alkyl HALIDE. THEREFORE, the ORDER of reactivity is :
`CH_(3)ClgtCH_(3)CH_(2)Clgt(CH_(3))_(2)CHClgt(CH_(3))_(3)C Cl`


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