Which of the following cyclopropane derivatives is chiral?

Acis-1,2-Dichlorocyclopropane
Btrans-1,2-Dichlorocyclopropane
C1,1-Dichlorocyclopropane
DChlorocyclopropane

Answer: B

cis-1,2-Dichlorocyclopropane has an internal mirror plane (meso, achiral). 1,1-Dichlorocyclopropane and chlorocyclopropane each have a mirror plane through the substituted carbon and the opposite CH

_{2}

. The trans-1,2-isomer has two stereocentres of the same descriptor (R,R or S,S), no mirror plane, and is chiral.

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