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B
cyclobutane
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C
cyclopentane
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D
cyclohexane
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Solution
The correct option is A cyclopropane In cyclopropane,the C-C-C bond angles are 60° whereas tetrahedral 109.5° bond angles are expected.
The intense angle strain leads to nonlinear orbital overlap of its sp3 orbitals.
Because of the bond's instability, cyclopropane is more reactive than other alkanes. Since any three points make a plane and cyclopropane has only three carbons, cyclopropane is planar.
The H-C-H bond angle is 115° whereas 106° is expected as in the CH2 groups of propane.