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Q. No.Select the correct option based on statements below:
| Assertion (A): | 2-butyne on controlled hydrogenation with Pd/CaCO3 (Lindlar's catalyst) in presence of PbO gives cis 2-butene. |
| Reason (R): | Hydrogenation occurs at the surfaces of metal-containing adsorbed hydrogen. |
| 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 |
53%
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Assertion(A): Alkanes having more than three carbon atoms exhibit chain isomerism.
Reason(R): All carbon atoms in alkanes are sp-hybridized.
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): All carbon atoms in alkanes are sp-hybridized.
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: Aliphatic Hydrocarbon -Nomenclature, Isomerism & Mechanism |
83%
From NCERT
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Given below are two statements:
| Assertion (A): | Alkenes and series of cycloalkanes of hydrocarbons have the same general formula. |
| Reason (R): | Either insertion of a double bond or formation of a ring reduces the number of hydrogen atoms of the corresponding alkane by 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 true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Aliphatic Hydrocarbon -Nomenclature, Isomerism & Mechanism |
78%
From NCERT
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| 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%
From NCERT
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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 |
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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 |
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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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