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Q. No.Which of the following is correct about carbon to carbon bonds?
| a. | The length of carbon to carbon bond increases in the order C≡C, C=C, C-C |
| b. | The strength of the C=C bond is more than the strength of the C-C bond. |
| c. | The carbon atoms are joined by six electrons in the C≡C bond. |
| 1. | b and c only | 2. | a and c only |
| 3. | a, b and c | 4. | a and b only |
Subtopic: Aliphatic Hydrocarbon- Physical Properties |
77%
Level 2: 60%+
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| Assertion (A): | The boiling point of neopentane is less than that of isopentane |
| Reason (R): | The higher the branching, the lower the boiling point of a compound. |
| 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 |
89%
Level 1: 80%+
Please attempt this question first.
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Please attempt this question first.
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 |
55%
Level 3: 35%-60%
Hints
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%+
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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 |
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 |
52%
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%
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