Select the correct statement(s) about the tert-butyl cation $(CH X_{3}) X_{3} C X^{+}$ .

ANine C-H bonds can overlap with the empty $p$ orbital through hyperconjugation.
BThe cationic carbon is $s p^{2}$ hybridised and the $C X_{3} C X^{+}$ skeleton is planar.
CIt is paramagnetic because the cationic carbon has an unpaired electron.
DIt is more stable than the isopropyl cation.

Answer: A, B, D

The cationic carbon has three sigma bonds, so it is

s p^{2}

and planar, with 9 alpha C-H bonds (

3 \times 3

). It has 6 electrons, all paired, so it is diamagnetic. Having more alkyl groups, it is more stable than

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