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Karnataka Board PUCPUC Science 2nd PUC Class 12

Which is the correct increasing order of boiling points of the following compounds? 1-Iodobutane, 1-Bromobutane, 1-Chlorobutane, Butane - Chemistry

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Question

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

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

Options

  • Butane < 1-Chlorobutane < 1-Bromobutane < 1-Iodobutane

  • 1-Iodobutane < 1-Bromobutane < 1-Chlorobutane < Butane

  • Butane < 1-Iodobutane < 1-Bromobutane < 1-Chlorobutane

  • Butane < 1-Chlorobutane < 1-Iodobutane < 1-Bromobutane

MCQ
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Solution

Butane < 1-Chlorobutane < 1-Bromobutane < 1-Iodobutane

Explanation:

The higher the surface area, the higher will be the intermolecular forces of attraction and thus boiling point too. Boiling point increases with increase in molecular mass of halogen atom for the similar type of alkyl halide. Butane has no halogen atom and rest of all three compounds are halo derivatives of butane.

Atomic mass of iodine is highest so the boiling point of 1-iodobutane is maximum among all the given compounds.

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Chapter 10: Haloalkanes and Haloarenes - Exercises [Page 140]

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NCERT Exemplar Chemistry [English] Class 12
Chapter 10 Haloalkanes and Haloarenes
Exercises | Q I. 30. | Page 140

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