JEE Main · 2008 · 27 Apr 2008 · Offline · General Organic Chemistry

WhatsApp Email

The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is

(A) $- COOH, - SO_{3} H, - CONH_{2}, - CHO$
(B) $- SO_{3} H, - COOH, - CONH_{2}, - CHO$ ✓ Correct
(C) $- CHO, - COOH, - SO_{3} H, - CONH_{2}$
(D) $- CONH_{2}, - CHO, - SO_{3} H, - COOH$

Answer: (B)

Solution

In IUPAC naming the principal characteristic group is chosen by a fixed seniority order. Working down that order for the groups given, the sulphonic acid group ranks first, the carboxylic acid group next, the amide group after that, and the aldehyde group last, so the decreasing order of priority is

- S O_{3} H > - COOH > - CON H_{2} > - CHO

JEE Main · 2008 · 27 Apr 2008 · Offline · 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 →