Ncert Exercises & Solutions

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

1-Iodobutane, 1-Bromobutane, 1-Chlorobutane, Butane

1.	Butane < 1-Chlorobutane < 1-Bromobutane < 1-Iodobutane
2.	1-Iodobutane < 1-Bromobutane < 1-Chlorobutane < Butane
3.	Butane < 1-Iodobutane < 1-Bromobutane < 1-Chlorobutane
4.	Butane < 1-Chlorobutane < 1-Iodobutane < 1-Bromobutane