1.

Which of the following carbocations is least stable ?A. `C_(6)H_(5)overset(+)CH_(2)`B. `p-NO_(2)-C_(6)H_(4)-CH_(2)^(+)`C. `p-CH_(3)O-C_(6)H_(4)-CH_(2)^(+)`D. `p-Cl-C_(6)H_(4)-CH_(2)^(+)`

Answer» Correct Answer - B
`p -NO_(2)-C_(6)H_(4) - overset(+)CH_(2)` is the least stable carbocation. This is due to the electron withdrawing effect of - `NO_(2)` group at p-position


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