Chemistry - STEREO ISOMERISM Question with Solution | TestHub

Question Explanation:

The question asks which compound has the maximum heat of combustion, i.e., which compound is least stable and therefore releases the most energy on complete combustion.

Concept:

Heat of Combustion, Ring Strain, Stability of Cycloalkanes

Solution:

Heat of combustion is inversely proportional to stability.

More ring strain → less stability → higher heat of combustion.

Among cycloalkanes:

Cyclopropane > Cyclobutane > Cyclopentane > Cyclohexane (in terms of strain).

The compound in Option (1) is a substituted cyclopropane, which has maximum angle strain

(≈60°) and torsional strain, making it the least stable.

Final Answer: Option (A)