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Q. No.| Assertion(A): | Aldol condensation is usually carried out in a dilute solution of a strong base. |
| Reason(R): | Concentrated solution of strong base involves Cannizzaro 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: Name Reaction |
79%
From NCERT
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Consider the given two statements:
| Assertion (A): | p-chlorobenzoic acid is a stronger acid than benzoic acid. |
| Reason (R): | Chlorine has an electron-donating resonance effect (+R). |
| 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 but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Carboxylic Acids: Preparation & Properties |
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Consider the given two statements:
| Assertion(A): | Formic acid reduces Tollen's reagent. |
| Reason(R): | Compounds containing the —CHO group reduce Tollen's reagent. |
| 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 |
52%
From NCERT
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Assertion(A): Lower aldehydes and ketones are soluble in water but the solubility decreases as the molecular masses increase.
Reason(R): Distinction between aldehydes and ketones can be made by Tollen's test.
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): Distinction between aldehydes and ketones can be made by Tollen's test.
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: Aldehydes & Ketones: Preparation & Properties | Name Reaction |
90%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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 statements.
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 statements.
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%
From NCERT
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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%
From NCERT
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