- 1(current)
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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyConsider 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. |
From NCERT
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAssertion(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 |
To view explanation, please take trial in the course below.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyConsider 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. |
From NCERT
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyCompounds A, B, C, D, E, and F are the following:
The compounds that can give aldehyde(s) upon ozonolysis is/are:
| (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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyConsider the given two statements:
| 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) 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 |
To view explanation, please take trial in the course below.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology- 1(current)
Q. No.
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