Q32 / 160 · AP EAMCET 2011 · Chemistry

Assertion (A) Cyclohexane is the most stable cycloalkane. Reason (R) Cyclopropane and cyclobutane are less stable due to angle strain and torsional strain. The correct answer is

  • Correct answer
    A
    Both (A) and (R) are true but (R) is not the correct explanation of (A).
  • B
    (A) is true but (R) is not true.
  • C
    (A) is not true but (R) is true.
  • D
    Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of (A).

Solution

In cycloalkane the heat of combustion of cyclohexane $\left(657.9 \mathrm{~kJ} \mathrm{~mol}^{-1}\right)$ is the lowest hence it is the most stable cycloalkane. Cyclopropane and cyclobutane are less stable due to angle strain and torsional strain, therefore cyclopropane and cyclobutane are reactive cycloalkane.

Hence, the correct answer is option: 'A'.

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