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Q. No.Given below are two statements:
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.
Subtopic: Aliphatic Hydrocarbon -Nomenclature, Isomerism & Mechanism |
85%
Level 1: 80%+
Hints
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 |
79%
Level 2: 60%+
Hints
| 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 |
67%
Level 2: 60%+
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Consider the given two statements:
| 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) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
Level 4: Below 35%
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Given below are two statements:
| Assertion (A): | Alkyl benzene is not prepared by Friedel-Crafts alkylation of benzene. |
| Reason (R): | Alkyl halides are less reactive than acyl halides in the Friedel-Crafts 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. | Both (A) and (R) are False. |
| 4. | (A) is True, but (R) is False. |
Subtopic: Aromatic Hydrocarbons - Benzene - Structure, Preparation & Chemical Reactions |
Level 4: Below 35%
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Given below are two statements:
| 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): | A double bond is more reactive than a triple bond towards an 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. | Both (A) and (R) are False. |
| 4. | (A) is False, but (R) is True. |
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
51%
Level 3: 35%-60%
Hints
Consider the given two statements:
Select the correct option:
| Assertion (A): | Propene reacts with HBr in the presence of H2O2 to give Markovnikov's addition product. |
| Reason (R): | H2O2 forms free radicals 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 but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
Level 4: Below 35%
Hints
| 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 |
60%
Level 2: 60%+
Hints
Given below are two statements:
| Statement I: | Treatment of 1,2-dibromopropane with zinc produces cyclopropane. |
| Statement II: | The reaction of alkyl halides with any metal is called a substitution reaction. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Statement I is correct and Statement II is incorrect. |
| 4. | Both Statement I and Statement II are incorrect. |
Subtopic: Aliphatic Hydrocarbon- Physical Properties |
54%
Level 3: 35%-60%
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Consider the given two statements:
| 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 True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Aromatic Hydrocarbons - Benzene - Structure, Preparation & Chemical Reactions |
53%
Level 3: 35%-60%
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