Question

Relative stabilities of the following carbocations will be in the order
`{:(overset(o+)(C)H_(3),CH_(3)overset(o+)(CH_(2)),overset(o+)(C)H_(2)OCH_(3),),((i)," "(ii)," "(iii),):}`
A. `(iii) gt (ii) gt (i)`
B. `(iii) lt (ii) lt (i)`
C. `(ii) gt (iii) gt (i)`
D. `(iii) gt (i) gt (ii)`

Answer 1

Correct Answer - A
The dispersal of the charge stabilizes the carbocation. More the number of alkyl groups, the greater the dispersal of positive charge and there fore, more the stability of carbocation, thus `overset(+)(C_(2))H_(5) gt overset(+)(C)H_(3). -OCH_(3)` is an electron donating group, thus it will increases the stability of carbocation, hence the expected order is,
`(iii) gt (ii) gt (i)`.