Question

Which of the following carbocation is most stable ?
(a) `(CH_(3))_(3)C overset(+)(C)H_(2)` (b) `(CH_(3))_(3)overset(+)(C)` (c) `CH_(3)CH_(2)overset(+)(C)H_(2)` (d) `CH_(3)overset(+)(C)HCH_(2)CH_(3)`

Answer 1

The order of stability of carbocation is : `3^(@) gt 2^(@)gt 1^(@)`
(a) `underset(1^(@) " Carbocation")((CH_(3))_(3)C - overset(+)(C)H_(2))` (b) `underset(3^(@) "Carbocation")((CH_(3))_(3)overset(+)(C))` (c) `underset(1^(@) "Carbocation")(CH_(3)CH_(2)overset(+)(C)H_(2))` (d) `underset(2^(@) "Carbocation")(CH_(3)overset(+)(C)HCH_(2)CH_(3))`
Since `3^(@)` carbocations are the most stable, therefore, option (b) is correct.