question_answer 61)

  Arrange the following compounds in increasing order of boiling point.                Propan-1-ol, butan-1-ol, butan-2-ol, pentan-1-ol (a) Propan-l-ol, butan-2-ol, butan-1-ol, pentan-1-ol (b) Propan-l-ol, butan-1-ol, butan-2-ol, pentan-ol (c) Pentan-l-ol, butan-2-ol, butan-1-ol, propan-l-ol (d) Pentan-1-ol, butan-1-ol, butan-2-ol, propan-l-ol

Answer:

  (a) The boiling points increase as the molecular mass of the alcohol increases. Further, among isomeric alcohols, 1° alcohols have higher boiling points than 2° alcohols. In the light of these facts, the b.ps increase in the order : propan-1-ol < butan-2-ol < butan-1-ol < pentan-1-ol, therefore, option (a) is correct.