Select the correct statement(s) about the 3,3-dimethylbutan-2-yl cation, $CH X_{3} - CH X^{+} - C (CH X_{3}) X_{3}$ .

AA 1,2-hydride shift can convert it to a tertiary cation.
BThe number of alpha hydrogens (excluding the hydrogen on the cationic carbon itself) is 3.
CThe rearranged cation is more stable than the starting cation.
DA 1,2-methyl shift converts it to the 2,3-dimethylbutan-2-yl cation, a tertiary cation.

Answer: B, C, D

The neighbouring

C (CH X_{3}) X_{3}

carbon has no hydrogen, so only a methyl shift is possible (statement 3 is false). The only alpha hydrogens are those of the

CH X_{3}

on the other side, so 3. Methyl shift gives the tertiary

(CH X_{3}) X_{2} C X^{+} - CH (CH X_{3}) X_{2}

, which is more stable.