Question

The highest boiling point is expected for

• A.
• B.
• C.
• D. All have same boiling point

Answer 1

The correct option is A

Boiling point is directly proportional to Molecular size
Boiling point is directly proportional to van der Waals force
Boiling point is directly proportional to Molar mass

Here compound has similar molecular mass but they have different boiling point due to branching in the molecules.
Like alkanes, straight chain alkenes also have higher boiling points than their isomeric branched counterparts.
Here, compound (a) is the straight chain hexene molecule.
Compound (b) and (c) has more branching than (a).
Therefore, (a) has higher boiling point.