General Organic Chemistry & Isomerism · JEE Main previous year questions

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2025 26 questions

Q532025 · 8 Apr 2025 · Shift 2
Match the LIST-I with LIST-II $LIST-I A. Carbocation B. C-Free radical C. Nucleophile D. Electrophile LIST-II I. Species that can supply a pair of electrons. II. Species that can receive a pair of electrons. III. s p^{2} hybridized carbon with empty p-orbital. IV. s p^{2} /s p^{3} hybridized carbon with one unpaired electron.$ Choose the \textbf{correct} answer from the options given below:
1. A.A-IV, B-II, C-III, D-I
2. B.A-II, B-III, C-I, D-IV
3. C.A-III, B-IV, C-I, D-II
4. D.A-III, B-IV, C-II, D-I
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Answer: C
Q572025 · 8 Apr 2025 · Shift 2
1. A.1-Ethylcyclopent-2-en-3-ol
2. B.4-Ethylcyclopent-2-en-1-ol
3. C.1-Ethyl-3-hydroxycyclopent-2-ene
4. D.4-Ethyl-1-hydroxycyclopent-2-ene
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Answer: B
Q632025 · 8 Apr 2025 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: C
Q722025 · 4 Apr 2025 · Shift 1· Numerical answer
In Dumas' method for estimation of nitrogen 1 g of an organic compound gave 150 mL of nitrogen collected at 300 K temperature and 900 mm Hg pressure. The percentage composition of nitrogen in the compound is ____ % (nearest integer) (Aqueous tension at $300 K = 15 mm Hg$ )
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Answer: 20
Q582025 · 4 Apr 2025 · Shift 2
1. A.4-Hydroxyhept-6-en-1-yne
2. B.Hept-1-en-6-yn-4-ol
3. C.Hept-6-en-1-yn-4-ol
4. D.4-Hydroxyhept-1-en-6-yne
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Answer: B
Q622025 · 3 Apr 2025 · Shift 1
1. A.B & C Only
2. B.C & D Only
3. C.A,B & C Only
4. D.A & B Only
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Answer: D
Q712025 · 3 Apr 2025 · Shift 1· Numerical answer
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Answer: 109
Q732025 · 3 Apr 2025 · Shift 1· Numerical answer
$0.5 g$ of an organic compound on combustion gave $1.46 g$ of $CO_{2}$ and $0.9 g$ of $H_{2} O$ . The percentage of carbon in the compound is ___________. (Nearest integer) [Given : Molar mass (in $g mol^{- 1}$ ) $C : 12$ , $H : 1$ , $O : 16$ ]
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Answer: 80
Q742025 · 3 Apr 2025 · Shift 1· Numerical answer
The number of optical isomers exhibited by the iron complex ( $A$ ) obtained from the following reaction is_________. $FeCl_{3} + KOH + H_{2} C_{2} O_{4} \to A$
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Answer: 2
Q532025 · 3 Apr 2025 · Shift 2
1. A.3-Bromo-2-hydroxy-5-nitrobenzoic acid
2. B.2-Hydroxy-3-bromo-5-nitrobenzoic acid
3. C.3-Bromo-4-hydroxy-1-nitrobenzoic acid
4. D.5-Nitro-3-bromo-2-hydroxybenzoic acid
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Answer: A
Q622025 · 3 Apr 2025 · Shift 2
Given below are two statements : Statement I : Hyperconjugation is not a permanent effect. Statement II : In general, greater the number of alkyl groups attached to a positively charged Cation, greater is the hyperconjugation interaction and stabilization of the cation. In the light of the above statements, choose the correct answer from the options given below
1. A.Statement I is false but Statement II is true
2. B.Statement I is true but Statement II is false
3. C.Both Statement I and Statement II are false
4. D.Both Statement I and Statement II are true
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Answer: A
Q702025 · 3 Apr 2025 · Shift 2
In Dumas' method for estimation of nitrogen $0.4 g$ of an organic compound gave $60 mL$ of nitrogen collected at $300 K$ temperature and $715 mm Hg$ pressure. The percentage composition of nitrogen in the compound is (Given : Aqueous tension at $300 K = 15 mmHg$ )
1. A. $15.71%$
2. B. $17.46%$
3. C. $7.85%$
4. D. $20.95%$
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Answer: A
Q552025 · 2 Apr 2025 · Shift 1
1. A. $a, c, d, e, h$ aromatic and $b, f, g$ not aromatic
2. B. $b, e, f, g$ aromatic and $a, c, d, h$ not aromatic
3. C. $a, b, c, d$ aromatic and $e, f, g, h$ not aromatic
4. D. $e, g$ aromatic and $a, b, c, d, f, h$ not aromatic
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Answer: A
Q572025 · 2 Apr 2025 · Shift 2
In Dumas' method for estimation of nitrogen, $0.5 gram$ of an organic compound gave $60 mL$ of nitrogen collected at $300 K$ temperature and $715 mm Hg$ pressure. The percentage composition of nitrogen in the compound (Aqueous tension at $300 K = 15 mmHg$ ) is ____%.
1. A.20.87
2. B.12.57
3. C.1.257
4. D.18.67
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Answer: B
Q682025 · 2 Apr 2025 · Shift 2
Match List - I with List - II. $List - I (Purification technique) (A) (B) (C) (D) Distillation (simple) Fractional distillation Distillation under reduced pressure Steam distillation List - II (Mixture of organic compounds) (I) (II) (III) (IV) Diesel + Petrol Aniline + Water Chloroform + Aniline Glycerol + Spent-lye$ Choose the correct answer from the options given below :
1. A.(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
2. B.(A)-(III), (B)-(IV), (C)-(II), (D)-(I)
3. C.(A)-(II), (B)-(IV), (C)-(I), (D)-(III)
4. D.(A)-(II), (B)-(III), (C)-(IV), (D)-(I)
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Answer: A
Q542025 · 29 Jan 2025 · Shift 2
Given below are two statements : Statement (I): In partition chromatography, stationary phase is thin film of liquid present in the inert support. Statement (II): In paper chromatography, the material of paper acts as a stationary phase. In the light of the above statements, choose the correct answer from the options given below :
1. A.Statement I is true but Statement II is false
2. B.Statement I is false but Statement II is true
3. C.Both Statement I and Statement II are false
4. D.Both Statement I and Statement II are true
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Answer: A
Q682025 · 29 Jan 2025 · Shift 2
1. A.
2. B.
3. C.
4. D.
Show answer
Answer: B
Q652025 · 28 Jan 2025 · Shift 1
1. A. $A > B > C > D$
2. B. $C > B > A > D$
3. C. $B > C > A > D$
4. D. $C > A > B > D$
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Answer: D
Q532025 · 24 Jan 2025 · Shift 1
Given below are two statements I and II. Statement I : Dumas method is used for estimation of "Nitrogen" in an organic compound. Statement II : Dumas method involves the formation of ammonium sulphate by heating the organic compound with conc $H_{2} S O_{4}$ . In the light of the above statements, choose the correct answer from the options given below
1. A.Statement I is true but Statement II is false
2. B.Statement I is false but Statement II is true
3. C.Both Statement I and Statement II are true
4. D.Both Statement I and Statement II are false
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Answer: A
Q572025 · 24 Jan 2025 · Shift 1
1. A.
2. B.
3. C.
4. D.
Show answer
Answer: C
Q752025 · 24 Jan 2025 · Shift 2· Numerical answer
The possible number of stereoisomers for 5-phenylpent-4-en-2-ol is ________.
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Answer: 4
Q592025 · 23 Jan 2025 · Shift 2
1. A.(A) – (III), (B) – (IV), (C) – (I), (D) – (II)
2. B.(A) – (I), (B) – (IV), (C) – (III), (D) – (II)
3. C.(A) – (III), (B) – (II), (C) – (I), (D) – (IV)
4. D.(A) – (II), (B) – (II), (C) – (I), (D) – (IV)
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Answer: A
Q592025 · 22 Jan 2025 · Shift 1
1. A.2
2. B.1
3. C.3
4. D.4
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Answer: D
Q622025 · 22 Jan 2025 · Shift 1
The incorrect statements regarding geometrical isomerism are : (A) Propene shows geometrical isomerism. (B) Trans isomer has identical atoms/groups on the opposite sides of the double bond. (C) Cis-but-2-ene has higher dipole moment than trans-but-2-ene. (D) 2-methylbut-2-ene shows two geometrical isomers. (E) Trans-isomer has lower melting point than cis isomer. Choose the correct answer from the options given below :
1. A.(A) and (E) Only
2. B.(A), (D) and (E) Only
3. C.(C), (D) and (E) Only
4. D.(B) and (C) Only
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Answer: B
Q692025 · 22 Jan 2025 · Shift 1
1. A.5-Methoxycarbonyl-2-methylhexanoic acid
2. B.Methyl-5-carboxy-2-methylhexanoate.
3. C.2-Carboxy-5-methoxycarbonylhexane.
4. D.Methyl-6-carboxy-2,5-dimethylhexanoate.
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Answer: A