Question

Arrange the following compounds in increasing order of boiling points . Propan-1-ol , butan-1-ol , butan-2-ol, pentan-1-ol.

• A. Propan-1-ol, butan-2-ol,butan-1-ol ,pentan-1-ol
• B. Propan-1-ol, butan-1-ol,butan-2-ol ,pentan-1-ol
• C. Pentan-1-ol , butan-2-ol , butan-1-ol , propan -1-ol
• D. Pentan-1-ol , butan-1-ol , butan-2-ol , propan -1-ol

Answer 1

The correct option is A Propan-1-ol, butan-2-ol,butan-1-ol ,pentan-1-ol

The boiling point increases as the moleculer mass of the alcohol increases. Further, among isomeric alcohols, $1^0$ alcohols have higher boiling points than $2^0$ alcohols.

Therefore the b.p.t increases in the order: propan-1-ol < butan-2-ol < butan-1-ol < pentan-1-ol.