Question

Which one of the following has the least boiling point?
(a) 2, 2– dimethylpropane (b) n-butane
(c) 2-methylpropane (d) n-pentane

Answer 1

Explanation:

2, 2– dimethylpropane has least boiling point

Answer 2

The compound having the least boiling point is 2–methylpropane.

Option: (c)

Explanation:

• The more the length of a carbon chain the more is the boiling point.

• Hence the boiling point of butane and pentane is more than that of propane.

• Among methylpropane and dimethyl propane, the molecule mass of dimethyl propane is more than that of methyl propane.

• As the molecular mass is directly proportional to the boiling point and the boiling point of 2 methyl propane is a more.

To know more about the boiling point of different organic compounds,

Why does any organic compound have low boiling and melting point

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