MCQ
Which of the following compounds has the highest boiling points?
  • A
    $CH _3 CH _2 CH _2 Cl$
  • $CH _3 CH _2 CH _2 CH _2 Cl$
  • C
    $\left( CH _3\right)_3 Cl$
  • D
    $CH _3 CH \left( CH _3\right) CH _2 Cl$

Answer

Correct option: B.
$CH _3 CH _2 CH _2 CH _2 Cl$
The forces of attraction between the molecules of a compound get stronger as they get bigger in size and have more electrons. Also, for a straight-chain compound, the points of interaction between the molecules are more than for a branched compound having the same molecular formula. Thus $CH_3CH_2CH_2CH_2Cl$ has the highest melting point since it is the longest chain compound among the given options.

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