1.

Which one of the following species is most stable

Answer»

`p-O_(2)N-C_(6)H_(4)-overset(+)(C)H_(2)`
`p-CH_(3)O-C_(6)H_(4)-overset(+)(C)H_(2)`
`p-Cl-C_(6)H_(4)-overset(+)(C)H_(2)`
`C_(6)H_(5)-overset(+)(C)H_(2)`

SOLUTION :
Nitro-group is electron withdrawing therefore DECREASES STABILITY.

Methoxy group is electron releasing.
Therefore increases stability by DONATING electron.

Chlorine is also electron withdrawing but its effect is less than `-NO_(2)` group.
HENCE, correct order of stability.


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