General Organic Chemistry & Isomerism · JEE Main previous year questions

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2021 18 questions

Q662021 · 1 Sept 2021 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: A, D
Q682021 · 1 Sept 2021 · Shift 2
The stereoisomers that are formed by electrophilic addition of bromine to trans-but-2-ene is/are :
1. A.2 enantiomers and 2 mesomers
2. B.2 identical mesomers
3. C.2 enantiomers
4. D.1 racemic and 2 enantiomers
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Answer: B
Q682021 · 26 Aug 2021 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: C
Q692021 · 26 Aug 2021 · Shift 2
The number of stereoisomers possible for 1, 2-dimethyl cyclopropane is :
1. A.One
2. B.Four
3. C.Two
4. D.Three
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Answer: D
Q752021 · 26 Aug 2021 · Shift 2
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Barium carbonate is insoluble in water and is highly stable. Reason (R) : The thermal stability of the carbonates increases with increasing cationic size.
1. A.Both (A) and (R) are true and (R) is the true explanation of (A)
2. B.(A) is true but (R) is false
3. C.Both (A) and (R) are true but (R) is not the true explanation of (A)
4. D.(A) is false but (R) is true.
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Answer: A
Q712021 · 27 Jul 2021 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: C
Q742021 · 25 Jul 2021 · Shift 1
An organic compound 'A' $C_{4} H_{8}$ on treatment with $KMn O_{4} / H^{+}$ yields compound 'B' $C_{3} H_{6} O$ . Compound 'A' also yields compound 'B' on ozonolysis. Compound 'A' is :
1. A.2-Methylpropene
2. B.1-Methylcyclopropane
3. C.But-2-ene
4. D.Cyclobutane
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Answer: A
Q842021 · 25 Jul 2021 · Shift 2· Numerical answer
[structure: cis-but-2-ene, $H_{3} C$ and H on each alkene carbon with both $C H_{3}$ on the same side] $+ B r_{2} CC l_{4}$ Product "P" Consider the above chemical reaction. The total number of stereoisomers possible for Product 'P' is ____.
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Answer: 2
Q872021 · 25 Jul 2021 · Shift 2· Numerical answer
0.8 g of an organic compound was analyzed 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 neutralized by the ammonia evolved during the analysis.
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Answer: 12
Q642021 · 22 Jul 2021 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: D
Q672021 · 22 Jul 2021 · Shift 2
Which of the following molecules does not show stereoisomerism?
1. A.3, 4-Dimethylhex-3-ene
2. B.3-Methylhex-1-ene
3. C.3-Ethylhex-3-ene
4. D.4-Methylhex-1-ene
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Answer: C
Q712021 · 22 Jul 2021 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: A
Q832021 · 22 Jul 2021 · Shift 2· Numerical answer
The number of acyclic structural isomers (including geometrical isomers) for pentene are ___________
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Answer: 6
Q662021 · 20 Jul 2021 · Shift 1
1. A.(C) and (D) only
2. B.(A), (B) and (D) only
3. C.(A) and (B) only
4. D.(A), (B) and (C) only
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Answer: C
Q792021 · 20 Jul 2021 · Shift 1
The metal that can be purified economically by fractional distillation method is :
1. A.Fe
2. B.Zn
3. C.Cu
4. D.Ni
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Answer: B
Q712021 · 18 Mar 2021 · Shift 2
An organic compound "A" on treatment with benzene sulphonyl chloride gives compound B. B is soluble in dil. NaOH solution. Compound A is :
1. A. $C_{6} H_{5} - ∣ C H_{3} CH - N H_{2}$
2. B. $C_{6} H_{5} - NHC H_{2} C H_{3}$
3. C. $C_{6} H_{5} - N - (C H_{3})_{2}$
4. D. $C_{6} H_{5} - C H_{2} NHC H_{3}$
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Answer: A
Q682021 · 16 Mar 2021 · Shift 1
1. A.(B), (C) and (D) only
2. B.(B) and (C) only
3. C.(A), (B) and (C) only
4. D.(A) and (B) only
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Answer: B
Q792021 · 25 Feb 2021 · Shift 2
The method used for the purification of Indium is :
1. A.zone refining
2. B.vapour phase refining
3. C.liquation
4. D.van Arkel method
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Answer: A