Exams › JEE Main › Chemistry

The trans-alkenes are formed by the reduction of alkynes with: (1) H2 - Pd/C, BaSO4 (2) NaBH4 (3) Na/liq. NH3 (4) Sn - HCl

1. H2 - Pd/C, BaSO4
2. NaBH4
3. Na/liq. NH3
4. Sn - HCl

Correct answer: Na/liq. NH3

Solution

The reduction of alkynes to trans-alkenes is effectively achieved using sodium in liquid ammonia, which facilitates the formation of the trans isomer through a unique mechanism that avoids the formation of the more stable cis isomer.

Related JEE Main Chemistry questions

• Arrange the following carbanions in decreasing order of basicity: (A) CH3CH2−, (B) CH2=CH−, and (C) HC≡C−.
• In acid-catalyzed hydration of alkenes, all alkenes except ethene generally give rise to which type of alcohol product?
• Which of the following organic compounds has the same hybridization as the carbon atom in its combustion product, CO2?
• What is formed when CH3MgX reacts with CH3C≡CH?
• Which of the following reagent sets can be used to convert propene into 1-propanol?
• When ethyne (H–C≡CH) is treated first with (1) NaNH2 in liquid NH3 and then with (2) CH3CH2Br, the product X is formed. If X is again subjected to the same two-step sequence, the product Y obtained is:

⚔️ Practice JEE Main Chemistry free + battle 1v1 →