How many compounds shown below are chiral?
(I) (II)
(III) (IV)
(V) (VI)
(VII) (VIII)
(IX) (X)

Question

How many compounds shown below are chiral? (I) (II) (III) (IV) (V) (VI) (VII) (VIII) (IX) (X)

TestHub · Accepted Answer

The chiral compounds are (II), (V), (VI) and (IX) - four in all. (II) is (2R,3R)-2,3-dibromobutane (no plane of symmetry); (V) is trans-1,2-dimethylcyclopropane (two stereocentres, no internal plane); (VI) is butan-2-ol (one stereocentre); (IX) is trans-1,2-dichlorocyclopropane (two stereocentres, no plane). The others are achiral: (I) meso-2,3-dibromobutane (internal plane), (III) 1,1-dichloroethane (no stereocentre), (IV) cis-1,2-dimethylcyclopropane (meso), (VII) chlorocyclohexane (plane through C₁ and C₄), (VIII) 2,2-dimethylbutane (no stereocentre) and (X) cis-1,2-dichlorocyclopropane (meso).

Ans. (B) 4.

Chemistry - STEREO ISOMERISM Question with Solution | TestHub

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