JEE Main 2023ChemistryHydrocarbonsMediumMCQ

JEE Main 2023 — Hydrocarbons Question with Solution

JEE Main 2023 (31 Jan Shift 1)

Question

Choose the correct set of reagents for the following conversion
transPh-CH=CH-CH3→ cis Ph-CH=CH-CH3

Choose an option

Show full solutionCorrect option: B
Correct answer
B

Br2, alc KOH,NaNH2,H2

Lindlar Catalyst

Step-by-step explanation

A trans alkene can be converted to a vicinal dihalide through a halogenation reaction. The vicinal dihalide can undergo double elimination to afford an alkyne. The alkyne can undergo partial reduction to give a cis alkene.

The reagents needed to convert trans(Ph - CH = CH - CH3) to cis-(Ph - CH = CH - CH3) are shown in the reaction scheme below.

 

 

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the Hydrocarbons chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.

Solve interactively →

About this question

This is a previous-year question from JEE Main 2023, covering the Hydrocarbons chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.