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JEE Main levelSingle correct optionDifficulty 2 of 3st191

Assertion (A): 1,4-Dimethylcyclohexane has four stereoisomers because it has two stereocentres (). Reason (R): In 1,4-dimethylcyclohexane the two ring paths from C1 are identical, so C1 and C4 are not stereocentres in the four-different-groups sense and only cis/trans isomerism arises.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: D

1,4-Dimethylcyclohexane has only two stereoisomers (cis and trans), both achiral, so the assertion is false. The reason is true: at C1 the ring paths on either side lead to the same constitution, so C1 does not carry four different groups. The rule is not applicable here.
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