Question

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 1

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