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JEE Advanced levelSingle correct optionDifficulty 3 of 3cb075

Assertion: Ethyne is a stronger acid than ethene. Reason: The sp hybridised carbon has greater s-character than the carbon, so it is more electronegative and stabilises the conjugate base better.

  1. ABoth Assertion and Reason are true and Reason is the correct explanation of Assertion
  2. BBoth Assertion and Reason are true but Reason is not the correct explanation of Assertion
  3. CAssertion is true but Reason is false
  4. DAssertion is false but Reason is true

Answer: A

The acetylide ion carries its lone pair in an sp orbital (50% s), which is held closer to the nucleus than an orbital (33.3% s). The more electronegative carbon stabilises the anion, so ethyne loses a proton more easily. Both statements are true and the reason explains the assertion.
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