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JEE Main levelSingle correct optionDifficulty 2 of 3st177

What is the enantiomer of (2E,4R)-4-bromopent-2-ene?

  1. A(2Z,4R)-4-Bromopent-2-ene
  2. B(2Z,4S)-4-Bromopent-2-ene
  3. C(2E,4S)-4-Bromopent-2-ene
  4. D(2E,4R)-4-Bromopent-2-ene

Answer: C

An enantiomer is the mirror image: every stereocentre is inverted while the double-bond geometry is unchanged (a mirror plane does not turn E into Z). So (2E,4R) (2E,4S). The Z-isomers are diastereomers.
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