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Question

Which of the following compounds have higher boiling points?


A

1-Chlorobutane

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B

1-Chloropropane

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C

Isopropyl Chloride

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D

All of these

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Solution

The correct option is A

1-Chlorobutane


Explanation for correct option:

(A) 1-Chlorobutane

Relation of boiling point with alkyl chain:

  • The boiling point increases with an increase in the number of carbons in an alkyl chain.
  • The boiling point decreases with branching in the carbon chain due to a decrease in surface area, hence intermolecular force between molecules also decreases.
  • 1-Chlorobutane has the longest carbon chain and hence has the highest boiling point.

Structure of 1-Chlorobutane:

Explanation for incorrect options

(B) 1-Chloropropane

  • Shorter alkyl chains have a lower boiling point than alkyl halides with more carbon atoms.
  • The structure of 1-Chloropropane is given below:

(C) Isopropyl Chloride

  • Branched alkyl halides have a lower boiling point than unbranched ones.
  • The structure of Isopropyl Chloride is given below:

Hence, option (A) i.e. 1-Chlorobutane is correct.


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