question_answer

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

Correct Answer: D

Solution :

[d]  The order of substitution in different alkanes is \[3{}^\circ >2{}^\circ >1{}^\circ \] Thus the bromination of 2-methyl butane mainly gives 2-Bromo - 2 - methyl butane \[C{{H}_{3}}-\underset{\text{2-methyl}\,\,\text{butane}}{\mathop{C{{H}_{2}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{CH}}\,}}\,}}\,-C{{H}_{3}}\xrightarrow{B{{r}_{2}}}\]