JEE-MAIN SERIES Chemistry
Methods Of Purification Of Organic Compounds
12 previous year questions.
Volume: 12 Ques
Yield: Medium
High-Yield Trend
1
2026 1
2024 6
2022 1
2021 2
2019 1
2013 Chapter Questions 12 MCQs
01
PYQ 2013
medium
chemistry ID: jee-main
For which of the following compounds Kjeldahl method can be used to determine the percentage of Nitrogen ?
1
Nitrobenzene
2
Pyridine
3
Alanine
4
Diazomethane
02
PYQ 2019
medium
chemistry ID: jee-main
If dichloromethane (DCM) and water are used for differential extraction, which one of the following statements is correct ?
1
DCM and would stay as lower and upper layer respectively in the S.F.
2
DCM and will be miscible clearly
3
DCM and would stay as upper and lower layer respectively in the separating funnel (S.F.)
4
DCM and will make trubid/colloidal mixture
03
PYQ 2019
medium
chemistry ID: jee-main
The principle of column chromatography is :
1
Capillary action.
2
Gravitational force.
3
Differential adsorption of the substances on the solid phase.
4
Differential absorption of the substances on the solid phase.
04
PYQ 2021
medium
chemistry ID: jee-main
Using the provided information in paper chromatography
The calculated value of A is __________ .
05
PYQ 2022
medium
chemistry ID: jee-main
Given below are two statements:
Statement I: In ‘Lassaigne’s Test’, when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed.
Statement II: If both nitrogen and sulphur are present in an organic compound, then the excess of
sodium used in sodium fusion will decompose the sodium thiocyanate formed to give NaCN and Na2S.
In the light of the above statements, choose the most appropriate answer from the options given below:
Statement I: In ‘Lassaigne’s Test’, when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed.
Statement II: If both nitrogen and sulphur are present in an organic compound, then the excess of
sodium used in sodium fusion will decompose the sodium thiocyanate formed to give NaCN and Na2S.
In the light of the above statements, choose the most appropriate answer from the options given below:
1
Both Statement I and Statement II are correct.
2
Both Statement I and Statement II are incorrect.
3
Statement I is correct but Statement II is incorrect.
4
Statement I is incorrect but Statement II is correct.
06
PYQ 2022
medium
chemistry ID: jee-main
Vulcanization of rubber is carried out by heating a mixture of
1
isoprene and styrene
2
neoprene and sulphur
3
isoprene and sulphur
4
neoprene and styrene
07
PYQ 2022
medium
chemistry ID: jee-main
Which of the following is structure of a separating funnel?
1

2

3

4

08
PYQ 2022
medium
chemistry ID: jee-main
Kjeldahl’s method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from 0.55 g of the compound neutralised 12.5 mL of 1 M H2SO4 solution. The percentage of nitrogen in the compound is _____. (Nearest integer)
09
PYQ 2022
medium
chemistry ID: jee-main
C6H12O6 A B+CHI3
The number of carbon atoms present in the product B is_________.
The number of carbon atoms present in the product B is_________.
10
PYQ 2022
medium
chemistry ID: jee-main
Geraniol, a volatile organic compound, is a component of rose oil. The density of the vapour is 0.46 gL–1 at 257°C and 100 mm Hg. The molar mass of geraniol is ____ g mol –1. (Nearest Integer) [Given: R = 0.082 L atm K–1 mol–1]
11
PYQ 2024
medium
chemistry ID: jee-main
Methods used for purification of organic compounds are based on :
1
neither on nature of compound nor on the impurity present.
2
nature of compound only.
3
nature of compound and presence of impurity.
4
presence of impurity only.
12
PYQ 2026
medium
chemistry ID: jee-main
In carius method of estimation of 'Br' 1.53 gm of an organic compound gave 1 gm AgBr. The % of Br in organic compound is (At. mass of Ag and Br are 108 and 80 amu respectively)
1
35.23
2
43.53
3
27.81
4
22.71
