Chapter 5, Problem 5.56P

Interpretation Introduction

Interpretation:

Each given compound is to be matched to its heat of combustion.

Concept introduction:

If two molecules are isomers of each other, they have precisely the same combustion products. As a result, any difference in the heat of combustion must be attributed to differences in stabilities of the alkynes. The most stable compound has the smallest heat of combustion. Triple bond stability increases as the amount of alkyl substitution increases due to hyperconjugation. Alkyl substitution is the number of alkyl groups bonded to the alkyne carbon atoms.