JEE Main · 2025 · 08 Apr 2025 · Shift 2 · General Organic Chemistry

What is the correct IUPAC name of (see structure) ?

(A)4-Ethyl-1-hydroxycyclopent-2-ene
(B)1-Ethyl-3-hydroxycyclopent-2-ene
(C)1-Ethylcyclopent-2-en-3-ol
(D)4-Ethylcyclopent-2-en-1-ol✓ Correct

Answer: (D)

Solution

The ring is a cyclopentene carrying a hydroxyl group and an ethyl group. The hydroxyl group is the principal characteristic group, so the carbon bearing it is numbered 1. Numbering then continues so as to give the double bond the lowest locant, placing it between carbons 2 and 3, and the ethyl substituent then falls on carbon 4. The correct IUPAC name of the compound is 4-ethylcyclopent-2-en-1-ol.

JEE Main · 2025 · 08 Apr 2025 · Shift 2 · Single correct option

Practise more: all JEE Main PYQs on General Organic Chemistry →

More JEE Main questions on General Organic Chemistry

From the following, the least stable structure is:
JEE Main 2026View solution →
Identify correct statement from the following:

A. Propanal and propanone are functional isomers.
B. Ethoxyethane and methoxypropane are metamers.
C. But-2-ene shows optical isomerism.
D. But-1-ene and but-2-ene are functional isomers.
E. Pentane and 2, 2-dimethyl propane are cha …
JEE Main 2026View solution →
Match List-I with List-II.

List-I (Pair of Compounds):
A. 2-Methylpropene and but-1-ene
B. Cis-but-2-ene and trans-but-2-ene
C. 2-Butanol and diethyl ether
D. But-1-ene and but-2-ene

List-II (Type of Isomers):
I. Stereoisomers
II. Position isomers
III. Chain isomers
IV. Functio …
JEE Main 2026View solution →
Given below are two statements:

Statement-I: Compound (X), shown below, dissolves in $NaHCO_{3}$ solution and has two chiral carbon atoms

Statement-II: Compound (Y), shown below, has two carbons with $sp^{3}$ hybridization, one carbon with $sp^{2}$ an …
JEE Main 2026View solution →
The IUPAC name of the following comopound is :
JEE Main 2026View solution →
Consider all the structural isomers with molecular formula $C X_{5} H X_{11} Br$ are separately treated with KOH (aq) to give respective substitution products, without any rearrangement. The number of products which can exhibit optical isomerism from these is ____ .
JEE Main 2026View solution →