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JEE • CHEMISTRY • ORGANIC CHEMISTRY-SOME BASIC PRINCIPLES AND TECHNIQUES

Organic chemistry-some basic principles and techniques practice · Easy

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Showing 1-30 of 118 questions
1 Easy
1 of 118
Remembering +4 | -1
Common reactions of benzene and its derivatives are:
View answer and explanation
Correct option: B
Electrophilic substitution reactions
Option B (Electrophilic substitution reactions) is correct because benzene and its derivatives primarily undergo electrophilic substitution reactions due to the stability of the aromatic ring.
2 Easy
2 of 118
Remembering +4 | -1
Isomerism among compounds due to the migration of a proton is known as :
View answer and explanation
Correct option: C
Tautomerism
Option C (Tautomerism) is correct because tautomerism is a type of isomerism involving the migration of a proton, resulting in two or more interconvertible structures.
3 Easy
3 of 118
Understanding +4 | -1
Which of the following is electrophile
View answer and explanation
Correct option: B
:CH2:C{H_2}
The correct answer is B. Carbene (:CH2CH_2) is an electrophile because it is electron deficient and seeks electrons.
4 Easy
4 of 118
Remembering +4 | -1
Ammonia molecule is :
View answer and explanation
Correct option: D
An acid
Option A (A nucleophile) is correct because ammonia has a lone pair of electrons on the nitrogen atom, making it a good nucleophile.
5 Easy
5 of 118
Understanding +4 | -1
The basic strength of
CH≡C_I,CH2=C_HII  ,CH3C_H2III\mathop {\mathrm{CH} \equiv \mathop \mathrm{C}\limits^\_ }\limits_I \mathrm{,}\mathop {\mathrm{C}{\mathrm{H}_2} = \mathop \mathrm{C}\limits^\_ \mathrm{H}}\limits_{II\;} ,\mathop {\mathrm{C}{\mathrm{H}_3}\mathop \mathrm{C}\limits^\_ {\mathrm{H}_2}}\limits_{III}
Will be in order
View answer and explanation
Correct option: A
I<II<IIII\mathrm{ } < II < III
Option A (I<II<IIII < II < III) is correct because the basic strength is inversely proportional to the stability of the conjugate acid, and the stability increases in the order: alkyne < alkene < alkane.
6 Easy
6 of 118
Understanding +4 | -1
The ratio of σ−\sigma - and π−\pi -bonds in benzene is:
View answer and explanation
Correct option: B
4
Option B (4) is correct because the ratio of sigma to pi bonds in benzene is 12:3, which simplifies to 4:1.
7 Easy
7 of 118
Remembering +4 | -1
Naphthalene can be easily purified by
View answer and explanation
Correct option: A
Sublimation
Option A (Sublimation) is correct because naphthalene is a volatile solid that can be easily purified by sublimation, where it transitions directly from solid to gas.
8 Easy
8 of 118
Remembering +4 | -1
In organic compounds sulphur is estimated as:
View answer and explanation
Correct option: B
BaSO4\mathrm{BaS}{\mathrm{O}_4}
Option B (BaSO4\mathrm{BaSO_4}) is correct because in organic compounds, sulfur is estimated as barium sulfate (BaSO4\mathrm{BaSO_4}) using Carius method.
9 Easy
9 of 118
Understanding +4 | -1
Among the following compounds nitrobenzene, benzene, aniline and phenol, the strongest basic behaviour in acid medium is exhibited by :
View answer and explanation
Correct option: B
Aniline
Option B (Aniline) is correct because aniline is the most basic among the given compounds due to the availability of the lone pair of electrons on the nitrogen atom for protonation.
10 Easy
10 of 118
Application +4 | -1
Haemoglobin is a chromoprotein having four atoms of Fe\mathrm{Fe} in each molecule. Analysis showed 0.35%0.35 \% Fe.\text{Fe}. What is the molecular weight of haemoglobin?
View answer and explanation
Correct option: A
64000 amu{6 4 0 0 0} \mathrm{~a m u}
Option C (9.5) is correct because it is the pH calculated from the dissociation constants and concentrations of the acid and base.
11 Easy
11 of 118
Remembering +4 | -1
Compounds which rotate plane polarised light in clockwise direction are known as :
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Correct option: A
Dextrorotatory
Option A (Dextrorotatory) is correct because compounds that rotate plane-polarized light in a clockwise direction are called dextrorotatory.
12 Easy
12 of 118
Understanding +4 | -1
The IUPAC name of the compound CH3CONHBr\mathrm{C}{\mathrm{H}_3}\mathrm{CONHBr} is
View answer and explanation
Correct option: C
N-bromoethanamide
Option C (N-bromoethanamide) is correct because it correctly names the compound with the bromine atom attached to the nitrogen atom of the ethanamide group.
13 Easy
13 of 118
Analyzing +4 | -1
Among the following, the pair that is not a pair of metamers is
View answer and explanation
Correct option: B
CH3OCH2CH2CH3 & CH3OCH(CH3)2\mathrm{CH}_3 \mathrm{OCH}_2 \mathrm{CH}_2 \mathrm{CH}_3 \,\&\, \mathrm{CH}_3 \mathrm{OCH}\left(\mathrm{CH}_3\right)_2
The correct answer is B because CH3OCH2CH2CH3\mathrm{CH}_3 \mathrm{OCH}_2 \mathrm{CH}_2 \mathrm{CH}_3 and CH3OCH(CH3)2\mathrm{CH}_3 \mathrm{OCH}(\mathrm{CH}_3)_2 are position isomers, not metamers.
14 Easy
14 of 118
Remembering +4 | -1
‘Adsorption’ principle is used for which of the
following purification method?
View answer and explanation
Correct option: B
Chromatography
Option B (Chromatography) is correct because adsorption is the core principle behind chromatographic separation techniques.
15 Easy
15 of 118
Understanding +4 | -1
In Lassaigne’s test, a blue colour is obtained if the organic compound contains nitrogen. The blue colour is due to
View answer and explanation
Correct option: B
Fe4[Fe(CN)6]3\mathrm{F}{\mathrm{e}_4}{\left[ {\mathrm{Fe}{{\left( {\mathrm{CN}} \right)}_6}} \right]_3}
Option B (Fe4[Fe(CN)6]3\mathrm{F}{\mathrm{e}_4}{\left[ {\mathrm{Fe}{{\left( {\mathrm{CN}} \right)}_6}} \right]_3}) is correct because the blue color in Lassaigne's test is due to the formation of ferric ferrocyanide, also known as Prussian blue.

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16 Easy
16 of 118
Remembering +4 | -1
Ferric ion forms a prussian blue coloured solution due to the formation of:
View answer and explanation
Correct option: C
Fe4[Fe(CN)6]3\mathrm{F}{\mathrm{e}_4}{\left[ {\mathrm{Fe}{{\left( {\mathrm{CN}} \right)}_6}} \right]_3}
Option C (Fe4[Fe(CN)6]3\mathrm{Fe}_4{\left[ {\mathrm{Fe}{{\left( {\mathrm{CN}} \right)}_6}} \right]_3}) is correct because Prussian blue is formed by the reaction of ferric ions with ferrocyanide ions, resulting in the complex Fe4[Fe(CN)6]3\mathrm{Fe}_4{\left[ {\mathrm{Fe}{{\left( {\mathrm{CN}} \right)}_6}} \right]_3}.
17 Easy
17 of 118
Application +4 | -1
A mixture of 2-bromopropane and bromoethane is heated with sodium metal in ether medium. The alkane/s formed during the reaction is/are
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because the Wurtz reaction can produce butane, 2,3-dimethylbutane, and 2-methylbutane from the given reactants.
18 Easy
18 of 118
Application +4 | -1
The IUPAC name of the given compound is CH≡C−CH=CH2\mathrm{CH} \equiv \mathrm{C}-\mathrm{CH}=\mathrm{CH}_2
View answer and explanation
Correct option: C
But-1-ene-3-yne
Option C (But-1-ene-3-yne) is correct because the IUPAC naming prioritizes the double bond over the triple bond when numbering the carbon chain.
19 Easy
19 of 118
Analyzing +4 | -1
The molecular formula of a saturated compound is C2H4Br2{\mathrm{C}_2}{\mathrm{H}_4}\mathrm{B}{\mathrm{r}_2}.

This formula permits the existence of :
View answer and explanation
Correct option: C
Positional isomers
Option C is correct because the compound C₂H₄Br₂ can exist as 1,1-dibromoethane and 1,2-dibromoethane, which are positional isomers.
20 Easy
20 of 118
Remembering +4 | -1
Qualitative test of halogens in an organic compound is made by
View answer and explanation
Correct option: B
Beilstein test
Option B (Beilstein test) is correct because the Beilstein test is used to detect the presence of halogens in organic compounds.
21 Easy
21 of 118
Understanding +4 | -1
The family to which methoxyethene belongs, is :
View answer and explanation
Correct option: C
Unsaturated ether
Option C is correct because methoxyethene (CH3OCH=CH2) contains both an ether functional group (R-O-R') and a carbon-carbon double bond, making it an unsaturated ether.
22 Easy
22 of 118
Understanding +4 | -1
The reaction (CH3)3CBr→H2O  (CH3)3  C.OH  is:{\left( {\mathrm{C}{\mathrm{H}_3}} \right)_3}\mathrm{CBr}\xrightarrow{{{H_2}O}}\mathrm{\;}{\left( {\mathrm{C}{\mathrm{H}_3}} \right)_3}\mathrm{\;C}.\mathrm{OH\;is}:
View answer and explanation
Correct option: C
Substitution reaction
Option C is correct because the reaction involves the replacement of a bromine atom with a hydroxyl group, which is the definition of a substitution reaction.
23 Easy
23 of 118
Remembering +4 | -1
Cyclohexane is :
View answer and explanation
Correct option: B
Alicyclic compound
Option B (Alicyclic compound) is correct because cyclohexane is a cyclic aliphatic hydrocarbon, meaning it's a saturated carbon ring structure.
24 Easy
24 of 118
Remembering +4 | -1
Electrophiles are :
View answer and explanation
Correct option: B
Lewis acids
Option B (Lewis acids) is correct because electrophiles are electron-deficient species that accept electron pairs, which is the definition of Lewis acids.
25 Easy
25 of 118
Remembering +4 | -1
A racemic mixture is a mixture of :
View answer and explanation
Correct option: B
dd-and its ll-isomers in equal proportions
Correct Answer + Core Reason: Option B (dd- and its ll-isomers in equal proportions) is correct because a racemic mixture contains equal amounts of enantiomers.
26 Easy
26 of 118
Understanding +4 | -1
−I-\text{I} effect is exhibited by which one of the following.
View answer and explanation
Correct option: A
−CN-\mathrm{CN}
Option A (-CN) is correct because the cyano group (-CN) is a strong electron-withdrawing group and exhibits a significant -I effect.
27 Easy
27 of 118
Understanding +4 | -1
Removal of hydrogen atom is easier when it is attached to :
View answer and explanation
Correct option: C
3∘^ \circ carbon
Option C (3∘^\circ carbon) is correct because the removal of a hydrogen atom is easier from a 3∘^\circ carbon due to the stability of the resulting 3∘^\circ free radical.
28 Easy
28 of 118
Understanding +4 | -1
Identify which of the following group act as +M+ M as well as −m- m?
View answer and explanation
Correct option: B
−Cl- Cl
Option B (−Cl- Cl) is correct because chlorine can exhibit both +M (through resonance donation) and -I (inductive withdrawal) effects due to the presence of lone pairs and its electronegativity.
29 Easy
29 of 118
Remembering +4 | -1
The arrangement of atoms that characterises a particular stereoisomer is called :
View answer and explanation
Correct option: B
Configuration
Option B (Configuration) is correct because configuration refers to the specific spatial arrangement of atoms that defines a stereoisomer.
30 Easy
30 of 118
Analyzing +4 | -1
The maximum number of alkyl groups in C8H18{\mathrm{C}_8}{\mathrm{H}_{18}} is :
View answer and explanation
Correct option: A
6
Option A (6) is correct because the structure (CH3)3C-C(CH3)3 has the maximum number of alkyl groups (6 methyl groups) attached to the main carbon chain.
Revision notes and key takeaways

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Key Takeaways

  • ✓ This set contains 118 single-correct-answer MCQs on ORGANIC CHEMISTRY-SOME BASIC PRINCIPLES AND TECHNIQUES.
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