Count every hydrogen atom that is on a carbon atom directly bonded to the carbon bearing bromine (beta-hydrogens) in 2-bromo-2,3-dimethylbutane, $(CH X_{3}) X_{2} CBr - CH (CH X_{3}) X_{2}$ . Give the total number.

Numerical answer type, tolerance 0.5.

Answer: 7

The carbon bearing Br (C2) has two methyl groups with 3 H each, giving 6, and the C3 methine carbon with 1 H. Total beta-hydrogens

= 2 \times 3 + 1 = 7