Monobromination of 2,3,4-trimethylpentane yields four
isomers. give the name and percent of each isomer produced, assuming
thatthe rate of bromination of
carbon atoms proceeds in the ratio 1: 82: 1640,respectively.

3-Bromomethyl-2,4- Dimethyl Pentane, 3-Bromo-2,3,4-Trimethyl Pentane, 2-Bromo-2,4,4-Trimethyl Pentane, 2-Bromomethyl-4,4-Dimethyl Pentane.

Yields 9, 164, 1640, 6 relative amounts. More details in the Fig. below.

Explanation:

1. they vary with a higher number because boiling is way hotter than melting