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Q. No.Given below are two statements:
Assertion (A):
Isobutanal does not give an iodoform test.
Reason (R):
It does not have \(\alpha-\)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: Name Reaction |
60%
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Assertion(A): The pKa of acetic acid is lower than that of phenol.
Reason(R): Phenoxide ion is more resonance stabilized.
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): Phenoxide ion is more resonance stabilized.
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: Carboxylic Acids: Preparation & Properties |
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Assertion(A): p-O2N — C6H5COCH3 is prepared by Friedel Crafts acylation of nitrobenzene.
Reason(R): Nitrobenzene easily undergoes an electrophilic 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 statement but R is false.
4. Both A and R are false statements.
Reason(R): Nitrobenzene easily undergoes an electrophilic 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 statement but R is false.
4. Both A and R are false statements.
Subtopic: Aldehydes & Ketones: Preparation & Properties |
53%
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| Assertion (A): | In presence of NaBH4, \(~~~~~~~~~~~~~~~~~~~~~~~~~O\\ ~~~~~~~~~~~~~~~~~~~~~~~~~\|\\ CH_2=CH-C-H\) is reduced to give \(CH_3-CH_2-CH_2OH.\) |
| Reason (R): | NaBH4 reduces conjugated double bonds also. |
| 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: Aldehydes & Ketones: Preparation & Properties |
62%
From NCERT
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Assertion(A): Acetic acid is a weaker acid than formic acid.
Reason(R): +l effect of CH3 makes the acetic acid weaker.
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): +l effect of CH3 makes the acetic acid weaker.
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: Carboxylic Acids: Preparation & Properties |
91%
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| Assertion (A): | Benzaldehyde is less reactive than acetaldehyde towards nucleophiles. |
| Reason (R): | Carbonyl carbon in benzaldehyde has less positive charge than that of carbonyl carbon in acetaldehyde due to resonance. |
| 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: Aldehydes & Ketones: Preparation & Properties |
78%
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Assertion(A): \(~~~~~~~~~~~~O\\ ~~~~~~~~~~~~\|\\ HO-C-CH_3 \) does not undergo haloform reaction.
Reason(R): It has no \(\alpha-\)hydrogen atom.
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 has no \(\alpha-\)hydrogen atom.
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: Name Reaction |
54%
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Assertion(A): In crossed Cannizarro's reaction, HCHO is oxidized while C6H5CHO is reduced.
Reason(R): Nucleophile (OH-) attacks on HCHO. Hence, formaldehyde is oxidized.
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): Nucleophile (OH-) attacks on HCHO. Hence, formaldehyde is oxidized.
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: Name Reaction |
82%
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| Assertion (A): | Formic acid can be oxidized to carbonic acid. |
| Reason (R): | Formic acid does not give brisk effervescence with NaHCO3. |
| 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: Carboxylic Acids: Preparation & Properties |
52%
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Given below are two statements:
| Assertion (A): | Aldehydes and ketones give nucleophilic addition reaction but acyl derivatives give nucleophilic substitution reaction. |
| Reason (R): | Aldehydes and ketones contain stronger bases and poor leaving groups in comparison to acyl derivatives. |
| 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: Aldehydes & Ketones: Preparation & Properties | Acid Derivatives - Preparation, Properties & Uses |
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