1.

Which one is most reactive towards S_(N)1 reaction?

Answer»

`C_(6)H_(5)CH_(2)Br`
`C_(6)H_(5)CH(C_(6)H_(5))Br`
`C_(6)H_(5)CH(CH_(3))Br`
`C_(6)H_(5)C(CH_(3))(C_(6)H_(5))Br`

Solution :Reactivity in `S_(N)1` reactions depends UPON the STABILITY of the carbocation intermediate. Since the stability of the CARBOCATIONS increases in the order:

Therefore, the alkyl HALIDE, `C_(6)H_(5)C(CH_(3))(C_(6)H_(5))Br,` i.e., (d) is the most reactive.


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