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Questions Available: 28
Year: 2024
Topic: Organic Chemistry – Some Basic Principles and Techniques
1.
The most stable carbocation among the following is:
(1).
(2).
(3).
(4).

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Year: 2021
Topic: Organic Chemistry – Some Basic Principles and Techniques
2.
The correct structure of 2, 6-Dimethyl-dec-4-ene is:
(1).
(2).
(3).
(4).

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Year: 2021
Topic: Organic Chemistry – Some Basic Principles and Techniques
3.
What is the IUPAC name of the organic compound formed in the following chemical reaction ?
(1).
2-methyl propan-2-ol
(2).
pentan-2-ol
(3).
pentan-3-ol
(4).
2-methyl butan-2-ol

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Year: 2021
Topic: Organic Chemistry – Some Basic Principles and Techniques
4.
Identify the compound that will react with Hinsberg's reagent to give a solid which dissolves in alkali:
(1).
(2).
(3).
(4).

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Year: 2025
Topic: Organic Chemistry – Some Basic Principles and Techniques
5.
Which one of the following compounds can exist as cis-trans isomers?
(1).
1,2-Dimethylcyclohexane
(2).
Pent-1-ene
(3).
2-Methylhex-2-ene
(4).
1,1-Dimethylcyclopropane

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Year: 2025
Topic: Organic Chemistry – Some Basic Principles and Techniques
6.
Which one of the following reactions does NOT belong to "Lassaigne's test"?
(1).
(2).
(3).
(4).

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Year: 2024
Topic: Organic Chemistry – Some Basic Principles and Techniques
7.
On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is konwon as
(1).
Distillation
(2).
Chromatography
(3).
Crystallization
(4).
Sublimation

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Year: 2023
Topic: Organic Chemistry – Some Basic Principles and Techniques
8.
In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with Fe3+ due to the formation of
(1).
NaSCN
(2).
[Fe(CN)5NOS]4-
(3).
[Fe(SCN)]2+
(4).
Fe[Fe(CN)6]3 . xH2O

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Year: 2023
Topic: Organic Chemistry – Some Basic Principles and Techniques
9.
Identify the product in the following reaction:
(1).
(2).
(3).
(4).

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Year: 2023
Topic: Organic Chemistry – Some Basic Principles and Techniques
10.
Consider the following compounds/species.
The number of compounds/species which obey Huckel's rule is
(1).
6
(2).
2
(3).
5
(4).
4

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Year: 2022
Topic: Organic Chemistry – Some Basic Principles and Techniques
11.
The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?
(1).
(2).
(3).
(4).

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Year: 2022
Topic: Organic Chemistry – Some Basic Principles and Techniques
12.
Which compound amongst the following is not anaromatic compound?
(1).
(2).
(3).
(4).

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Year: 2022
Topic: Organic Chemistry – Some Basic Principles and Techniques
13.
Which of the following sequence of reactions issuitable to synthesize chlorobenzene?
(1).
Benzene, Cl2, anhydrous FeCl3
(2).
Phenol, NaNO2, HCl, CuCl
(3).
(4).

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Year: 2022
Topic: Organic Chemistry – Some Basic Principles and Techniques
14.
The correct IUPAC name of the following compound is
(1).
1-bromo-5-chloro-4-methylhexan-3-ol
(2).
6-bromo-2-chloro-4-methythexan-4-ol
(3).
1-bromo-4-methyl-5-chlorohexan-3-ol
(4).
6-bromo-4-methyl-2-chlorohexan-4-ol

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Year: 2022
Topic: Organic Chemistry – Some Basic Principles and Techniques
15.
Compound X on reaction with O3 followed by Zn/H2O gives formaldehyde and 2-methyl propanal as products.
The compound X is
(1).
3-Methylbut-1-ene
(2).
2-Methylbut-1-ene
(3).
2-Methylbut-2-ene
(4).
Pent-2-ene

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Year: 2021
Topic: Organic Chemistry – Some Basic Principles and Techniques
16.
Dihedral angle of least stable conformer of ethane is:
(1).
120°
(2).
180°
(3).
60°
(4).
0°

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Year: 2021
Topic: Organic Chemistry – Some Basic Principles and Techniques
17.
An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is [Atomic wt. of C is 12, H is 1]
(1).
CH
(2).
CH2
(3).
CH3
(4).
CH4

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Year: 2021
Topic: Organic Chemistry – Some Basic Principles and Techniques
18.
The compound which shows metamerism is :
(1).
C5H12
(2).
C3H8O
(3).
C3H6O
(4).
C4H10O

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Year: 2021
Topic: Organic Chemistry – Some Basic Principles and Techniques
19.

Consider the above reaction and identify the missing reagent/chemical.
(1).
B2H6
(2).
Red Phosphorus
(3).
CaO
(4).
DIBAL-H

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Year: 2021
Topic: Organic Chemistry – Some Basic Principles and Techniques
20.
The reagent 'R' in the given sequence of chemical reaction is
(1).
H2O
(2).
CH3CH2OH
(3).
HI
(4).
CuCN/KCN

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Year: 2021
Topic: Organic Chemistry – Some Basic Principles and Techniques
21.
The intermediate compound "X" in the following chemical reaction is :
(1).
(2).
(3).
(4).

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Year: 2020
Topic: Organic Chemistry – Some Basic Principles and Techniques
22.
A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following ?
(1).
+R effect of -CH groups
(2).
-R effect of -CH groups
(3).
Hyperconjugation
(4).
-I effect of -CH3 groups

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Year: 2018
Topic: Organic Chemistry – Some Basic Principles and Techniques
23.
A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4. The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be
(1).
4.4
(2).
2.8
(3).
3.0
(4).
1.4

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Year: 2018
Topic: Organic Chemistry – Some Basic Principles and Techniques
24.
Which of the following carbocations is expected to be most stable ?
(1).
(2).
(3).
(4).

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Year: 2018
Topic: Organic Chemistry – Some Basic Principles and Techniques
25.
Which of the following is correct with respect to -1 effect of yje substituents? (R = alkyl)
(1).
-NR2 > -OR > -F
(2).
-NH2 > _OR > -F
(3).
-NR2 < -OR < -F
(4).
-NH2 < _OR < -F

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Year: 2017
Topic: Organic Chemistry – Some Basic Principles and Techniques
26.
The IUPAC name of the compound is
(1).
3-keto-2-methylhex-5-enal
(2).
3-keto-2-methylhex-4-enal
(3).
5-formylhex-2-en-3-one
(4).
5-methyl-4-oxohex-2-en-5-al

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Year: 2017
Topic: Organic Chemistry – Some Basic Principles and Techniques
27.
The correct statement regarding electrophile is
(1).
Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile.
(2).
Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile
(3).
Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electro-phile
(4).
Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile

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Year: 2016
Topic: Organic Chemistry – Some Basic Principles and Techniques
28.
The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is
(1).
The eclipsed conformation of ethane is more stable than staggered conformation, because eclipsed conformation has no torsional strain
(2).
The eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain
(3).
The staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain
(4).
The staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain

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