The answer that explains the higher boiling point of methanol than ethane or fluoro-methane, even though their molecular weights are nearly equal, is to be selected. Concept introduction: A hydrocarbon is organic compound consisting entirely of hydrogen and carbon. The temperature at which the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere is called boiling point. A hydrogen bonding is a partially electrostatic force of attraction between a hydrogen atom that is bound to more electronegative atom such as nitrogen, oxygen or fluorine and another atom bearing a lone pair of electrons. A molecular formula consists of the chemical symbols for the constituent elements followed by numeric subscripts describing the number of atoms of each element present in the molecule. Higher the molecular mass of a hydrocarbon, higher will be its boiling point. An unbranched alkane has a higher boiling point than branched alkanes . As the branching increases in an alkane, the boiling point decreases The alcohol of the same molecular weight has a higher boiling point due to the presence of hydrogen bonding in alcohols.

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Chapter 4, Problem 1Q

Interpretation Introduction

Interpretation:

The answer that explains the higher boiling point of methanol than ethane or fluoro-methane, even though their molecular weights are nearly equal, is to be selected.

Concept introduction:

A hydrocarbon is organic compound consisting entirely of hydrogen and carbon.

The temperature at which the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere is called boiling point.

A hydrogen bonding is a partially electrostatic force of attraction between a hydrogen atom that is bound to more electronegative atom such as nitrogen, oxygen or fluorine and another atom bearing a lone pair of electrons.

A molecular formula consists of the chemical symbols for the constituent elements followed by numeric subscripts describing the number of atoms of each element present in the molecule.

Higher the molecular mass of a hydrocarbon, higher will be its boiling point.

An unbranched alkane has a higher boiling point than branched alkanes. As the branching increases in an alkane, the boiling point decreases

The alcohol of the same molecular weight has a higher boiling point due to the presence of hydrogen bonding in alcohols.

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