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Q. No.
Assertion (A):
Toluene on Friedel Crafts methylation gives o- and p- xylene.
Reason (R):
-group bonded to benzene ring increases electron density at o- and p- position.
1.
Both (A) and (R) are True and (R) is the correct explanation of (A).
2.
Both (A) and (R) are True and (R) is not the correct explanation of (A).
3.
(A) is True but (R) is False.
4.
(A) is False but (R) is True.
Subtopic: Aromatic Hydrocarbons - Reactions & Mechanism |
91%
Level 1: 80%+
Hints
| Assertion (A): | Nitration of benzene with nitric acid requires the use of concentrated sulphuric acid. |
| Reason (R): | The mixture of concentrated sulphuric acid and concentrated nitric acid produces the electrophile, NO2+ . |
| 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. | (A) is False but (R) is True. |
Subtopic: Aromatic Hydrocarbons - Reactions & Mechanism |
88%
Level 1: 80%+
Hints
Given below are two statements:
| Assertion (A): | Among isomeric pentanes, 2,2-dimethylpropane has the highest boiling point. |
| Reason (R): | Branching does not affect the boiling point. |
| 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: Aliphatic Hydrocarbon- Physical Properties |
82%
Level 1: 80%+
Hints
Given below are two statements:
| Assertion (A): | The compound tetraene has the following structural formula. It is a cyclic and has conjugated 8π electrons system but it is not an aromatic compound. |
| Reason (R): | ( 4 n + 2 ) π electrons rule does not hold good for this compound and the ring is not planar. |
| 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. | (A) is False but (R) is True. |
Subtopic: Aromatic Hydrocarbons - Nomenclature, Isomerism & Huckel's Rule |
79%
Level 2: 60%+
Hints
Match the reactions given in Column-I with the type of reaction given in Column-II and mark the appropriate option:
| Column-I | Column-II | ||
| A. | CH2=CH2 + H2O \(\xrightarrow[]{H^{+}}\) CH3CH2OH |
1. | Hydrogenation |
| B. | CH2=CH2 + H2 \(\xrightarrow[]{Pd}\) CH3-CH3 |
2. | Halogenation |
| C. | CH2=CH2 + Cl2 → Cl-CH2-CH2-Cl |
3. | Polymerisation |
| D. | 3CH≡CH \(\xrightarrow[heat]{Cu \ tube}\) C6H6 |
4. | Hydration |
| 5. | Condensation | ||
Codes:
| Options: | A | B | C | D |
| 1. | 2 | 3 | 4 | 1 |
| 2. | 1 | 2 | 3 | 5 |
| 3. | 5 | 4 | 3 | 2 |
| 4. | 4 | 1 | 2 | 3 |
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
90%
Level 1: 80%+
Hints
Match the following reactants in Column I with the corresponding reaction products in Column II.
|
Column I |
Column II |
|
A. |
1. Benzoic acid |
|
B. |
2. Methyl phenyl ketone |
|
C. |
3. Toluene |
|
D. |
4. Chlorobenzene |
|
5. Benzene hexachloride |
| Options: | A | B | C | D |
| 1. | 4 | 3 | 2 | 1 |
| 2. | 1 | 2 | 3 | 5 |
| 3. | 5 | 4 | 3 | 2 |
| 4. | 4 | 5 | 3 | 2 |
Subtopic: Aromatic Hydrocarbons - Benzene - Structure, Preparation & Chemical Reactions |
92%
Level 1: 80%+
Hints
Match the hydrocarbons in Column I with the boiling points given in Column II.
| A. n-Pentane | 1. 282.5 K |
| B. Isopentane | 2. 309 K |
| C. Neopentane | 3. 301 K |
Codes
| Options: | A | B | C |
| 1. | 2 | 3 | 1 |
| 2. | 1 | 2 | 3 |
| 3. | 2 | 1 | 3 |
| 4. | 3 | 2 | 1 |
Subtopic: Aliphatic Hydrocarbon- Physical Properties |
88%
Level 1: 80%+
Hints
Among the following reactions, the incomplete combustion of methane is:
| 1. | \(2 {CH}_4+{O}_2 \xrightarrow[]{\mathrm{Cu/523 \ K/100 \ atm}} 2 {CH}_3 {OH}\) |
| 2. | \({CH}_4+{O}_2 \xrightarrow[]{{Mo_{2}O_{3}}} {HCHO}+{H}_2 {O}\) |
| 3. | \(CH_4 + O_2 → C + 2H_2O\) |
| 4. | \(CH_4 + 2O_2 → CO_2 + 2H_2O\) |
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
80%
Level 1: 80%+
Hints
Arrange the following alkyl halides in decreasing order of the rate of -elimination reaction with alcoholic KOH.
| A. | \(\mathrm{(CH_3)_2C(H)CH_2Br}\) |
| B. | CH3-CH2-Br |
| C. | CH3-CH2-CH2-Br |
1. A > B > C
2. C > B > A
3. B > C > A
4. A > C > B
Subtopic: Aliphatic Hydrocarbon - Methods of Preparation |
64%
Level 2: 60%+
Hints
Arrange the following hydrogen halides in order of their increasing reactivity with propene:
| 1. | HCl > HBr > HI | 2. | HBr > HI > HCl |
| 3. | HI > HBr > HCl | 4. | HCl > HI > HBr |
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
72%
Level 2: 60%+
Hints
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