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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ro033

Which statements about but-2-yne are correct?

  1. A/Lindlar catalyst gives cis-but-2-ene.
  2. BNa in liquid gives trans-but-2-ene.
  3. C in methanol does not reduce it.
  4. DExcess over Pd-C stops at but-2-ene.

Answer: A, B, C

Lindlar gives syn addition (cis); Na/ gives anti addition (trans); does not reduce an isolated alkyne. Over Pd-C the intermediate alkene is hydrogenated further to butane, so D is false.
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