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Q. No.
Assertion (A):
2-Bromobutane, in reaction with sodium ethoxide in ethanol, gives 1-butene as a major product.
Reason (R):
1-Butene is more stable than 2-butene.
1.
Both (A) and (R) are True and (R) is the correct explanation of (A).
2.
Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.
(A) is True but (R) is False.
4.
Both (A) and (R) are False.
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
66%
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Assertion(A): The addition of HBr on 2-butene gives two isomeric products.
Reason(R): The addition of HBr on 2-butene follows Markovnikov's rule.
1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. Both A and R are false statements.
Reason(R): The addition of HBr on 2-butene follows Markovnikov's rule.
1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. Both A and R are false statements.
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
From NCERT
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Assertion(A): Alkyl benzene is not prepared by Friedel-Crafts alkylation of benzene.
Reason(R): Alkyl halides are less reactive than acyl halides.
1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. Both A and R are false statements.
Reason(R): Alkyl halides are less reactive than acyl halides.
1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. Both A and R are false statements.
Subtopic: Aromatic Hydrocarbons - Benzene - Structure, Preparation & Chemical Reactions |
70%
From NCERT
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Assertion(A): \(CH\equiv C-CH_2-CH=CH_2\) adds up HBr to give \(CH\equiv C-CH_2-CH-CH_3\\ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|\\ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Br \) while \(CH\equiv C-CH=CH_2\) adds HBr to give \(CH_2= C-CH=CH_2\\ ~~~~~~~~~~~~~~|\\ ~~~~~~~~~~~~~Br\) .
Reason(R): Double bond is more reactive than triple bond towards electrophilic \(\)addition reaction.
1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. Both A and R are false statements.
Reason(R): Double bond is more reactive than triple bond towards electrophilic \(\)addition reaction.
1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. Both A and R are false statements.
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
52%
From NCERT
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Assertion(A): When propene reacts with H-Br in the presence of H2O2 it gives Markwonikoff's addition product.
Reason(R): H2O2 forms free radical which cause homolytic cleavage of H-Br.
1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true statement but R is false.
4. Both A and R are false statements.
Reason(R): H2O2 forms free radical which cause homolytic cleavage of H-Br.
1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true statement but R is false.
4. Both A and R are false statements.
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
From NCERT
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| Assertion (A): | Trans-but-2-ene has a higher boiling point than cis-but-2-ene. |
| Reason (R): | Trans-but-2-ene is more polar than cis-but-2-ene. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Aliphatic Hydrocarbon- Physical Properties |
58%
From NCERT
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| Assertion (A): | Treatment of 1,2-dibromopropane with zinc produces cyclopropane. |
| Reason (R): | The reaction of alkyl halides with any metal is called a substitution reaction. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Aliphatic Hydrocarbon- Physical Properties |
60%
From NCERT
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Assertion(A): Nitration of benzene is an example of an electrophilic substitution reaction.
Reason(R): It is a biomolecular reaction with an order of reaction 2.
1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is a true statement but R is false.
4. Both A and R are false statements.
Reason(R): It is a biomolecular reaction with an order of reaction 2.
1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is a true statement but R is false.
4. Both A and R are false statements.
Subtopic: Aromatic Hydrocarbons - Benzene - Structure, Preparation & Chemical Reactions |
From NCERT
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Assertion(A): H—Br addition with propene in the presence of organic peroxide gives anti-Markovnikov's addition product.
Reason(R): Organic peroxide causes heterolytic cleavage of H—Br.
1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is a true statement but R is false.
4. Both A and R are false statements.
Reason(R): Organic peroxide causes heterolytic cleavage of H—Br.
1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is a true statement but R is false.
4. Both A and R are false statements.
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
54%
From NCERT
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Compounds A, B, C, D, E, and F are the following:
The compounds that can give aldehyde(s) upon ozonolysis is/are:
1. A, B, D and F
2. A, C and E
3. B, D and E
4. A only
| A. | \(\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CHO}\) |
| B. | \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}=\mathrm{C} \left(\mathrm{CH}_{3}\right)_{2}\) |
| C. | \( \ \mathrm{CH}_{3} \mathrm{CH}=\mathrm{CH}-\mathrm{CH}_{3}\) |
| D. | \( \mathrm{CH}_{3} \mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_{2}-\mathrm{CH}_{3}\) |
| E. | \( \mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}_{2}\) |
| F. | \(\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_{3}, \) |
The compounds that can give aldehyde(s) upon ozonolysis is/are:
1. A, B, D and F
2. A, C and E
3. B, D and E
4. A only
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
86%
From NCERT
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