Question

Arrange the compounds of each set in order of reactivity towards $S_{n}2$ displacement: l-Bromo-S-methylbutane, 2-Bromo-2-methylbutane, 2-Bromo-3-methylbutane

Answer 1

The steric hindrance in some alkyl halides increases in an order of 1° < 2° < 3°, the rising order of reactivity completely towards SN2 displacement is given as 3° < 2° < 1°.

Though, the mentioned set of compounds are arranged in increased order of reactivity fully towards the SN2 displacement as mentioned below:

2-Bromo-2-methylbutane < 2-Bromo-3-methylbutane < 1-Bromo-3-methylbutane.