1.

The order of reactivity of : phi-CH_(3) (I),phi-CH_(2)-CH_(3) (II),andphi-C(CH_(3))_(3) (IV) Where phi=C_(6)H_(5)

Answer»

`IgtIIgtIIIgtIV`
`IVgtIIIgtIIgtI`
`IIgtIgtIIIgtIV`
`IIIgtIIgtIgtIV`

Solution :More are the number of `alpha-`hydrogen present in the alkyl group attached to the benzene ring more PRONOUNCED will be the hyperconjugation and the benzene ring will be more electron rich and easily be attacked by an electrophile. `alpha-`hydrogen in `-CH_(3), -CH_(2)-CH_(3),-CH(CH_(3))_(2)` respectively are three, two ONE and ZERO.


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