Which of the following pairs of structures represent the same enantiomer, and which represent different enantiomers?
(a) and
(b) and
(c) and
(d) and

Question

Which of the following pairs of structures represent the same enantiomer, and which represent different enantiomers? (a) and (b) and (c) and (d) and

TestHub · Accepted Answer

(a) Bromochlorofluoromethane: priorities Br $>$ Cl $>$ F $>$ H; the two drawings are opposite configurations (R vs S) : enantiomers.

(b) Both are 2-chlorobutane with the same configuration - the second is written from the other end of the chain : identical. (c) Both are (S)-lactic acid written differently (C(O)=O is the same carboxyl group) : identical. (d) Both are (S)-butan-2-ol written from the two ends of the chain : identical.

Ans. (C) (a) Enantiomers; (b), (c) and (d) identical.

Chemistry - STEREO ISOMERISM Question with Solution | TestHub

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