Question:
CH₃Cequiv CCH₃ H₂/Pt A D₂/Pt B.
The compounds A and B respectively are:
CH₃Cequiv CCH₃ H₂/Pt A D₂/Pt B.
The compounds A and B respectively are:
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• Syn addition preserves symmetry
• cis-alkenes often give meso products on syn addition
Updated On: Mar 19, 2026
- cis-butene-2 and rac-2,3-dideuterobutane
- trans-butene-2 and rac-2,3-dideuterobutane
- cis-butene-2 and meso-2,3-dideuterobutane
- trans-butene-2 and meso-2,3-dideuterobutane
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The Correct Option is C
Solution and Explanation
Step 1: Partial hydrogenation of 2-butyne with H₂/Pt gives cis-2-butene (syn addition).
Step 2: Addition of D₂ across the double bond also occurs via syn addition.
Step 3: Syn addition on a cis-alkene produces a meso compound.
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