First slide

Cycloalkanes

Question

Which of the following statements is wrong?

Moderate

A

The decreasing order of the numerical value of heat of combustion is
B

Cycloalkanes are planar.
C

Cyclopropane has higher heat of combustion per methylene (-CH₂-) group than that of cyclobutane.
D

With the exception of cyclopropane, cycloalkanes are non-planar.

Solution

i. More the number of C atoms, more is the heat of combustion. So, the correct order is (1).
ii. Cyclopropane has the highest heat of combustion per (CH₂) group.
iii. Except cyclopropane, cycloalkanes are non-planar.
So, the answer is (2)

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