Arrange the following compounds in the descending order of their boiling points (a) n-pentane (b) isopentane (c) neopentane

Engineering

Chemistry

Boiling point

Question

Arrange the following compounds in the descending order of their boiling points

(a) n-pentane
(b) isopentane
(c) neopentane

c > b > a

a > b > c

b > C > a

c > a > b

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Given :- Three compounds are:n-pentane, iso pentane, neopentane.
Solution :- Branching leaps to the decrease in boiling point. As surface area decreases on branching, intermolecular attraction force decreases.

So, n -pentane has highest boiling point thar isopentane and neopentane.

(a) CH₃ – CH₂ – CH₂ – CH₂ – CH₂ – CH₃

n-pentane

⇒ a > b > c

Hence option B is correct option.

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