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-2-ol, butan-2-ol, propan-1-ol

Answer 1

Answer: (A)

Propan-1-ol, butan-2-ol, butan-1-ol, pentan-1-ol

Answer 2

The boiling point increases as the molecular mass of the alcohol increase further, among isomeric alcohols $1º$ alcohols have higher boiling points than $2º$ alcohols therefore the b.pt. increase in the order:

Propan-1-ol <butan-2-ol< butan-1-ol < pentan-1-ol