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JEE Main levelSingle correct optionDifficulty 2 of 3st173

(1R,2S)-2-Methylcyclohexan-1-ol is given. Which statement about it is correct?

  1. AIt is the cis isomer and its enantiomer is (1S,2R)
  2. BIt is the trans isomer and its enantiomer is (1S,2R)
  3. CIt is the cis isomer and is identical with its mirror image (meso)
  4. DIt is the trans isomer and its enantiomer is (1S,2S)

Answer: A

For 2-methylcyclohexan-1-ol the cis isomers are (1R,2S) and (1S,2R) and the trans isomers are (1R,2R) and (1S,2S) (from CIP analysis of the two ring-carbon centres). The compound is cis, and its enantiomer inverts both descriptors to (1S,2R). It is not meso because OH and CH are different, so there is no internal mirror plane.
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