The photochemical reaction of 2-methylpropane with $\mathrm{F}_{2}$ gives 2-fluoro-2-methylpropane and 1-fluoro-2-methylpropane in 14:86 ratio. The corresponding ratio of the bromo products in the above reaction using $\mathrm{Br}_{2}$ is most likely to be
(a)$14:86$
(b)$50:50$
(c)$1:9$
(d)$99:1$
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
Bromination is highly selective for the tertiary C–H (late TS), giving ~99 : 1 tertiary : primary (d).