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JEE Main levelSingle correct optionDifficulty 2 of 3st019

Assertion (A): 2-Methylbut-2-ene does not show geometrical isomerism. Reason (R): One of its doubly bonded carbons carries two identical groups.

  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: A

2-Methylbut-2-ene is . C2 carries two identical groups, so swapping the groups on that carbon gives the same molecule and no cis/trans pair exists. Thus A is true, R is true, and R explains A.
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