Question

Which of the following compound has highest boiling points? A.n-pentane B.iso-butane C.butane. D.neopentane

Answer 1

Answer:

A. n-pentane

Explanation:

because n-pentane is straight chain and higher molar mass

Answer 2

Answer: Option (A) is the correct answer.

Explanation:

• It is known that longer is the carbon chain of a compound more will the surface area occupied by it. Hence, more will be its boiling point. And, more is the branching present in a compound lesser will be the surface area occupied by it.

Hence, lower will be its boiling point.

• For example, chemical formula of n-pentane is $C_{5}H_{12}$ and n-butane is $C_{4}H_{10}$.

• And, there will be branching present in iso-butane and neopentane. Therefore, as more number of linearly attached carbon atoms are present in n-pentane.

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