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JEE Main levelSingle correct optionDifficulty 2 of 3g1074

Assertion (A): Cyclopenta-1,3-diene is much more acidic than propene. Reason (R): The conjugate base of cyclopenta-1,3-diene is an aromatic anion with 6 electrons.

  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

Removing a proton from the group of cyclopentadiene gives a planar, cyclic, fully conjugated anion with 6 electrons. This is the aromatic cyclopentadienide ion, which is extra stable. So A is true and R explains it.
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