Question:
The reagent that is used to convert but-2-yne to trans-but-2-ene is
The reagent that is used to convert but-2-yne to trans-but-2-ene is
Updated On: Apr 4, 2025
\(Na/liquid NH_3\)
\(NaBH_4\)
- Sn/HCI
\(H_2/Pd/C\)
- Zn-Hg/HCl
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
To convert but-2-yne to trans-but-2-ene, we need to reduce the triple bond in but-2-yne (an alkyne) to a double bond in trans-but-2-ene (an alkene). This requires a specific reagent that induces partial hydrogenation and selectively gives the trans isomer.
The reagent used to achieve this transformation is sodium in liquid ammonia (Na/liquid NH₃). This reagent reduces alkynes to trans-alkenes via an anti-addition mechanism.
- H₂/Pd/C: Reduces the alkyne to cis-but-2-ene (syn addition), not the trans isomer.
- NaBH₄: A mild reducing agent, not suitable for reducing alkynes to alkenes.
- Sn/HCl: Typically used for reducing nitro groups, not alkynes.
- Na/liquid NH₃: Selectively reduces alkynes to trans-alkenes.
Correct Answer:
Correct Answer: (A) Na/liquid NH₃
Was this answer helpful?
0
0
Top KEAM Chemistry Questions
- The pH of a solution obtained by mixing 60 mL of 0.1 M BaOH solution at 40m of 0.15m HCI solution is
- $4\, g$ of copper was dissolved in concentrated nitric acid. The copper nitrate solution on strong heating gave $5\, g$ of its oxide. The equivalent weight of copper is :
- Green chemistry deals with
- Neopentyl bromide undergoes dehydrohalogenation to give alkenes even though it has no $\beta$- hydrogen. This is due to
- Plot of $ log\text{ }x/m $ against log $p$ is a straight line inclined at an angle of $ 45{}^\circ $ . When the pressure is $ 0.5 \,arm $ and Freundlich parameter. $ k $ is $ 10 $ , the amount of solute adsorbed per gram of adsorbent will be $ (log\text{ }5=0.6990) $
View More Questions
Top KEAM Questions
- i.$\quad$ They help in respiration ii.$\quad$ They help in cell wall formation iii.$\quad$ They help in DNA replication iv. $\quad$They increase surface area of plasma membrane Which of the following prokaryotic structures has all the above roles?
- A body oscillates with SHM according to the equation (in SI units), $x = 5 cos \left(2\pi t +\frac{\pi}{4}\right) .$ Its instantaneous displacement at $t = 1$ second is
- The pH of a solution obtained by mixing 60 mL of 0.1 M BaOH solution at 40m of 0.15m HCI solution is
Kepler's second law (law of areas) of planetary motion leads to law of conservation of
- If $\int e^{2x}f' \left(x\right)dx =g \left(x\right)$, then $ \int\left(e^{2x}f\left(x\right) + e^{2x} f' \left(x\right)\right)dx =$
View More Questions