Hydrocarbons Question 353
Question: Which one of the following has the minimum boiling point [AIEEE 2004]
Options:
A) 1-Butene
B) 1-Butyne
C) n-Butane
D) Isobutane
Show Answer
Answer:
Correct Answer: D
Solution:
Among the isomeric alkanes, the normal isomer has a higher boiling point than the branched chain isomer.
The greater the branching of the chain, the lower is the boiling point.
The n-alkane have larger surface area in comparison to branched chain isomer (as the shape approaches that of a sphere in the branched chain isomers).
Thus, intermolecular forces are weaker in branched chain isomers, there fore they have lower point in comparision to straight chain isomers.
BETA
