JEE Main 2022 — Chemistry Organic Chemistry

2022mcqeasy

The correct decreasing order of priority of functional groups in naming an organic compound as per IUPAC system of nomenclature is

Official previous-year question

Held on 26 Jul 2022 · Verified 6 Jul 2026.

Options

A
$-\mathrm{COOH}>-{\mathrm{CONH}}_{2}>-\mathrm{COCl}>-\mathrm{CHO}$
B
$-{\mathrm{SO}}_{3}H>-\mathrm{COCl}>-{\mathrm{CONH}}_{2}>-\mathrm{CN}$
C
D
$\mathrm{COOH}>--\mathrm{COOR}>-{\mathrm{CONH}}_{2}>-\mathrm{COCl}$

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Solution

In the case of polyfunctional compounds, one of the functional groups is chosen as the principal functional group and the compound is then named on that basis. The remaining functional groups, which are subordinate functional groups, are named as substituents using the appropriate prefixes. The choice of principal functional group is made on the basis of order of preference. The order of decreasing priority for some functional groups is:

$-\mathrm{COOH},–{\mathrm{SO}}_{3}H,-\mathrm{COOR}(R=\mathrm{alkyl}\mathrm{group}),\mathrm{COCl},-{\mathrm{CONH}}_{2},-\mathrm{CN},-\mathrm{HC}=O,>C=O,-\mathrm{OH},-{\mathrm{NH}}_{2},>C=C<,-C\equiv C-.$

For example, the IUPAC name of

${\mathrm{HOCH}}_{2}({\mathrm{CH}}_{2}{)}_{3}{\mathrm{CH}}_{2}{\mathrm{COCH}}_{3}$ is 7-hydroxyheptan-2-one.

The correct decreasing order of priority of given functional groups is

$-{\mathrm{SO}}_{3}H>-\mathrm{COCl}>-{\mathrm{CONH}}_{2}>-\mathrm{CN}$

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Options

$-\mathrm{COOH}>-{\mathrm{CONH}}_{2}>-\mathrm{COCl}>-\mathrm{CHO}$

$-{\mathrm{SO}}_{3}H>-\mathrm{COCl}>-{\mathrm{CONH}}_{2}>-\mathrm{CN}$

JEE Main 2022 Chemistry, General Organic Chemistry — option C figure

$\mathrm{COOH}>--\mathrm{COOR}>-{\mathrm{CONH}}_{2}>-\mathrm{COCl}$

Solution

For example, the IUPAC name of

${\mathrm{HOCH}}_{2}({\mathrm{CH}}_{2}{)}_{3}{\mathrm{CH}}_{2}{\mathrm{COCH}}_{3}$ is 7-hydroxyheptan-2-one.

The correct decreasing order of priority of given functional groups is

$-{\mathrm{SO}}_{3}H>-\mathrm{COCl}>-{\mathrm{CONH}}_{2}>-\mathrm{CN}$

JEE Main 2022 — Chemistry Organic Chemistry

Options

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Solution

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JEE Main 2022 — Chemistry Organic Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Organic Chemistry in other years

More JEE Main Organic Chemistry questions

Other Chemistry topics for JEE Main

Physical Chemistry

Inorganic Chemistry

Keep practicing Organic Chemistry