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Q.

Which of the following statements are correct? 

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a

Cycloheptane and cyclooctane are more stable than cyclohexane

b

The ring strain in cyclopropane is more than that in the cyclobutane 

c

The C – H bond in cyclopropane is shorter than in propane 

d

The H atoms in cyclopropane is more acidic than in propane 

answer is B.

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Detailed Solution

(A) Both are slightly less stable than cyclohexane.

(C) The observed bond angle H – C – H in cyclopropane is 114°. To account for this angle, it is

 postulated that the hybrid orbital of C involves more s – characters compared to the hybrid

orbital.

 (D) The C – H bonds in cyclopropane involves more s – character than those of an alkane.

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