Question

Which is the correct increasing order of boiling points of
the following compounds?
1 - bromoethane, 1 - bromopropane,1 - bromobutane,
Bromobenzene
(a) Bromobenzene < 1 - bromobutane < 1 - bromopropane
< 1- bromoethane
(b) Bromobenzene < 1 - bromobutane < 1 - bromopropane
< 1- bromobutane
(c) 1 - bromopropane < 1 - bromorpropane < 1 - bromoethane
< Bromobenzene
(d) 1 - bromoethane < 1 - bromopropane < 1 - bromobutane
< Bromobenzene

Answer 1

Explanation:

I think the correct answer is (a)

Answer 2

Question - Which is the correct increasing order of boiling points of the following compounds?

1-Bromoethane, 1-Bromopropane, 1-Bromobutane, Bromobenzene

A. Bromobenzene < 1-Bromobutane < 1-Bromopropane < 1-Bromoethane

B. Bromobenzene < 1-Bromoethane < 1-Bromopropane < 1-Bromobutane

C. 1-Bromopropane < 1-Bromobutane < 1-Bromoethane < Bromobenzene

D. 1-Bromoethane < 1-Bromopropane < 1-Bromobutane < Bromobenzene

Answer - Boiling point will follow the order - D. 1-Bromoethane < 1-Bromopropane < 1-Bromobutane < Bromobenzene.

Boiling point is the temperature at which liquid converts into vapour. The vapour pressure of liquid equals the atmospheric pressure at this temperature.

Boiling point of compounds increases with increase in number of carbon atoms.

This happens because Van Der Waal's interaction increases due to increased alkyl groups and hence boiling point increases.