Which isomer of bromobutane has lowest boiling point?

Answer: Tertiary butyl bromide

Tert-butyl bromide has lower boiling point because it has a spherical shape. As a result surface area decreases leading to smaller vander Waals forces between their molecules.

The boiling point of the compound is low if the compound has more branching. Tertiary butyl bromide has the highest branching, so it has a low boiling point.

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