Question

multiple choice 2 points which of the following cycloalkanes exhibits the greatest molar heat of combustion? cyclooctane cyclohexane cyclopropane cycloheptane cyclobutane

Explanation:

Step1: Recall molar - heat of combustion concept

The molar heat of combustion is related to the amount of energy released when one mole of a substance is completely burned. Larger molecules with more carbon - hydrogen bonds generally have higher molar heats of combustion.

Step2: Compare number of carbon atoms

Cyclooctane has 8 carbon atoms, cyclohexane has 6, cyclopropane has 3, cycloheptane has 7, and cyclobutane has 4. Since cyclooctane has the most carbon atoms among the given cycloalkanes, it has the greatest molar heat of combustion.

Answer:

A. cyclooctane