Which alkyl halide from the following pair is (i) Chiral and (ii) undergoes `S_(N)1` reaction faster ?
(a) `(CH_(3))_(3)CBr`
(b) `CH_(3)CH_(2)CHBrCH_(3)`

Explanation

(a) `H_(3)C-underset(CH_(3)(3^(@)))underset(|)overset(CH_(3))overset(|)(C)-Br` (b)
(i) Alkyl halide (b) is chiral because in this alkyl halide `C_(1)` carbon is attached to all four different groups.
(ii) (a) will undergo `SN^(1)` reaction faster because `3^(@)` alkyl halides are more reactive in `SN_(1)` mechanism.