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Which of the following statements is wrong?

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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.

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detailed solution

Correct option is B

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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