Hydrocarbons · NEET Preparation Chemistry
Which of the following reagents can be used to convert an alkyne to a cis-alkene?
Practice question from Hydrocarbons (NEET Preparation Chemistry), with the correct answer and a step-by-step solution.
medium · MCQ · Q-5C400B
Which of the following reagents can be used to convert an alkyne to a cis-alkene?
- A.Na in liquid NH3
- B.H2 in the presence of Lindlar's catalystCorrect answer
- C.Zn/HCl
- D.Red phosphorus and HI
Solution
Catalytic hydrogenation of alkynes using Lindlar's catalyst (palladized charcoal deactivated with quinoline or sulfur compounds) gives syn-addition of hydrogen, yielding cis-alkenes. Sodium in liquid NH3 gives trans-alkenes via a dissolving metal reduction.
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