Which of the following hydrocarbons has the highest normal boiling
1.butene
2.ethene
3.pentene
4.propene

Option (3) is the correct answer.

Explanation:

It is known that more is the carbon atoms attached linearly into a molecule more will be the boiling point of the molecule.

Also, more is the branching in a molecule, less will be the boiling point of atom.

Therefore, out of the given options pentene has highest number of carbon atoms, hence, pentene has the highest normal boiling point.

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1.solid

2.carbon dioxide

3.helium