Nomenclature and Characterisation

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JEE Main 2026

Comprehension Passage

Consider the following reaction sequence in which J, K, L and M are the major products. Given: Atomic mass (in amu): H : 1, C : 12, N : 14, O : 16, S : 32, Br : 80, Ba : 137

Question 1:

The volume of 1 M aqueous $H_{2} SO_{4}$ required to completely neutralize the ammonia evolved from 5.72 g of L in Kjeldahl's method of nitrogen estimation is ____ mL.

Question 2:

In sulphur estimation by Carius method, the amount of $BaSO_{4}$ formed from 3.79 g of M is ____ g.

JEE Advanced 2014

LEVELJEE Main

The correct combination of names for isomeric alcohols with molecular formula $C_{4} H_{10} O$ is/are-

* Multiple Correct Options

(A)

tert-butanol and 2-methylpropan-2-ol

(B)

tert-butanol and 1, 1-dimethylethan-1-ol

(C)

n-butanol and butan-1-ol

(D)

isobutyl alcohol and 2-methylpropan-1-ol

JEE Advanced 2015

LEVELJEE Advanced

The total number of stereoisomers that can exist for M is :

JEE Advanced 2020

LEVELJEE Main

Which one of the following structures has the IUPAC name 3-ethynyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid ?

The IUPAC name(s) of the following compound is(are)

* Multiple Correct Options

(A)

4-methylchlorobenzene

(B)

4-chlorotoluene

(C)

1-chloro-4-methylbenzene

(D)

1-methyl-4-chlorobenzene

JEE Advanced 2020

LEVELJEE Advanced

The Fischer projection of D-erythrose is shown below. D-Erythrose and its isomers are listed as P, Q, R, and S in Column-I. Choose the correct relationship of P, Q, R, and S with D-erythrose from Column II.

List-I

List-II

Newman projections P, Q, R and S are shown below : Which one of the following options represents identical molecules ?

Match the compounds in LIST-I with the observation in LIST-II, and choose the correct option.

List-I

List-II

(1)

Sodium fusion extract of the compound on boiling with

FeSO_{4}

, followed by acidification with conc.

H_{2} SO_{4}

, gives Prussian blue color.

(2)

Sodium fusion extract of the compound on treatment with sodium nitroprusside gives blood red color.

(3)

Addition of the compound to a saturated solution of

NaHCO_{3}

results in effervescence.

(4)

The compound reacts with bromine water to give a white precipitate.

(5)

Treating the compound with neutral

FeCl_{3}

solution produces violet color.

JEE Advanced 2018

LEVELJEE Advanced

For the given compound X, the total number of optically active stereoisomers is______.

JEE Main 2021

LEVELJEE Main

The number of acyclic structural isomers (including geometrical isomers) for pentene are ......... .

JEE Main 2020

LEVELJEE Main

The number of $s p^{2}$ -hybridised carbons present in "aspartame" is ............

JEE Main 2020

LEVELJEE Main

The IUPAC name of the following compound is

(A)

3-bromo-5-methylcyclopentane carboxylic acid

(B)

3-bromo-5-methylcyclopentanoic acid

(C)

5-bromo-3-methylcyclopentanoic acid

(D)

4-bromo-2-methylcyclopentane carboxylic acid

JEE Main 2019

LEVELJEE Main

The correct match between Item-I and Item-II is\n\n $A. B. C. D. Item-I (Drug) Chloroxylenol Norethindrone Sulphapyridine Penicillin P. Q. R. S. Item-II (Test) Carbylamine test Sodium hydrogen carbonate test Ferric chloride test Bayer’s test$

(A)

\to

R ; B

\to

P ; C

\to

S ; D

\to

(B)

\to

R ; B

\to

S ; C

\to

P ; D

\to

(C)

\to

Q ; B

\to

P ; C

\to

S ; D

\to

(D)

\to

Q ; B

\to

S ; C

\to

P ; D

\to

JEE Main 2015

LEVELJEE Main

Which of the following compound will exhibit geometrical isomerism?

1, 1-diphenyl-1-propane

JEE Main 2020

LEVELJEE Main

Which of the following compounds shows geometrical isomerism?

The number of compound(s) given below which contain(s) — COOH group is ……… . (i) Sulphanilic acid (ii) Picric acid (iii) Aspirin (iv) Ascorbic acid

JEE Main 2021

LEVELJEE Main

Nitrogen can be estimated by Kjeldahl's method for which of the following compound ?

If dichloromethane (DCM) and water ( $H_{2} O$ ) are used for differential extraction, which one of the following statements is correct?

(A)

DCM and

H_{2} O

would stay as lower and upper layer respectively in the S.F.

(B)

DCM and

H_{2} O

would stay as upper and lower layer respectively in the separating funnel (SF)

(C)

DCM and

H_{2} O

will be miscible clearly

(D)

DCM and

H_{2} O

will make turbid/colloidal mixture

JEE Main 2020

LEVELJEE Main

A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at $6 3^{\circ} C$ while the other boils at $6 0^{\circ} C$ . What is the best way to separate the two liquids and which one will be distilled out first?

(A)

Fractional distillation, 3-methylpentane

(B)

Fractional distillation, isohexane

(C)

Simple distillation, 3-methylpentane

(D)

Simple distillation, isohexane

JEE Main 2021

LEVELJEE Main

Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?

Fractional distillation

(D)

Reduced pressure distillation

JEE Main 2020

LEVELJEE Main

The Kjeldahl method of nitrogen estimation fails for which of the following reaction products?

What is the IUPAC name of the following compound ?

(A)

3-bromo-3-methyl-1, 2-dimethylprop-1-ene

(B)

3-bromo-1,2-dimethylbut-1-ene

(C)

2-bromo-3-methylpent-3-ene

(D)

4-bromo-3-methylpent-2-ene

JEE Main 2010

LEVELJEE Main

29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in 20 mL of 0.1 M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralization. The percentage of nitrogen in the compound is

0.8 g of an organic compound was analysed by Kjeldahl's method for the estimation of nitrogen. If the percentage of nitrogen in the compound was found to be 42%, then ......... mL of $1 M H_{2} S O_{4}$ would have been neutralised by the ammonia evolved during the analysis.

LEVELJEE Main

Amongst the following compounds, the optically active alkane having lowest molecular mass is

Comprehension Passage

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The volume of 1 M aqueous H2​SO4​ required to completely neutralize the ammonia evolved from 5.72 g of L in Kjeldahl's method of nitrogen estimation is ____ mL.

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } In sulphur estimation by Carius method, the amount of BaSO4​ formed from 3.79 g of M is ____ g.

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The correct combination of names for isomeric alcohols with molecular formula C4​H10​O is/are-

The total number of stereoisomers that can exist for M is :

Which one of the following structures has the IUPAC name 3-ethynyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid ?

The IUPAC name(s) of the following compound is(are)

The Fischer projection of D-erythrose is shown below. D-Erythrose and its isomers are listed as P, Q, R, and S in Column-I. Choose the correct relationship of P, Q, R, and S with D-erythrose from Column II.

List-I

List-II

Newman projections P, Q, R and S are shown below : Which one of the following options represents identical molecules ?

Match the compounds in LIST-I with the observation in LIST-II, and choose the correct option.

List-I

List-II

For the given compound X, the total number of optically active stereoisomers is______.

The number of acyclic structural isomers (including geometrical isomers) for pentene are ......... .

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The number of sp2-hybridised carbons present in "aspartame" is ............

The IUPAC name of the following compound is

Which of the following compound will exhibit geometrical isomerism?

Which of the following compounds shows geometrical isomerism?

The number of compound(s) given below which contain(s) — COOH group is ……… . (i) Sulphanilic acid (ii) Picric acid (iii) Aspirin (iv) Ascorbic acid

Nitrogen can be estimated by Kjeldahl's method for which of the following compound ?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } If dichloromethane (DCM) and water (H2​O) are used for differential extraction, which one of the following statements is correct?

Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?

The Kjeldahl method of nitrogen estimation fails for which of the following reaction products?

What is the IUPAC name of the following compound ?

29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in 20 mL of 0.1 M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralization. The percentage of nitrogen in the compound is

Amongst the following compounds, the optically active alkane having lowest molecular mass is

The volume of 1 M aqueous $H_{2} SO_{4}$ required to completely neutralize the ammonia evolved from 5.72 g of L in Kjeldahl's method of nitrogen estimation is ____ mL.

In sulphur estimation by Carius method, the amount of $BaSO_{4}$ formed from 3.79 g of M is ____ g.

The correct combination of names for isomeric alcohols with molecular formula $C_{4} H_{10} O$ is/are-

The number of $s p^{2}$ -hybridised carbons present in "aspartame" is ............

If dichloromethane (DCM) and water ( $H_{2} O$ ) are used for differential extraction, which one of the following statements is correct?