Question

The major product obtained in the photo catalysed bromination of $2$-methylbutane is :

• A. 1-bromo-2-methylbutane
• B. 1-bromo-3-methylbutane
• C. 2-bromo-3-methylbutane
• D. 2-bromo-2-methylbutane

Answer 1

Answer: (D)

$C{H}_3-\stackrel{\underset{|}{C}{H}_3}{C}H-C{H}_2-C{H}_3\stackrel{B{r}_2/hv}{\to }\underset{\text{(Major product)}}{C{H}_3-\underset{\stackrel{|}{B}r}{\stackrel{\underset{|}{C}{H}_3}{C}}-C{H}_2-C{H}_3}$

relatively ratio for bromination is
$1^{\circ }:2^{\circ }:3^{\circ }::1:82:1600$
Hence $3^{\circ }$ product will be major product