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Q. No.Which molecules among the following have a dipole moment?
a. 2,2-Dimethylpropane
b. trans-Pent-2-ene
c. cis-Hex-3-ene
d. 2,2,3,3 - Tetramethylbutane
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)
Subtopic: Aliphatic Hydrocarbon- Physical Properties |
65%
Level 2: 60%+
Hints
Which of the following is/are aromatic structure(s)?
| a. |  |
b. |  |
| c. |  |
d. |  |
| 1. | a and b | 2. | b and c |
| 3. | c and d | 4. | a and c |
Subtopic: Aromatic Hydrocarbons - Nomenclature, Isomerism & Huckel's Rule |
82%
Level 1: 80%+
Hints
Correct statement among the following is:
| a. | CH3-O-CH2⊕ is more stable than CH3-CH2⊕ |
| b. | (CH3)2CH⊕ is less stable than CH3-CH2-CH2⊕ |
| c. | CH2=CH-CH2⊕ is more stable than CH3-CH2-CH2⊕ |
| d. | CH2 = CH⊕ is more stable than CH3-CH2⊕ |
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
74%
Level 2: 60%+
Hints
For an electrophilic substitution reaction, the presence of a halogen atom in the benzene ring:
| A | Deactivates the ring by inductive effect |
| B | Deactivates the ring by resonance |
| C | Increases the charge density at the ortho and the para positions relative to the meta position by resonance |
| D | Directs the incoming electrophile to the meta position by increasing the charge density relative to the ortho and the para positions |
Choose the correct option:
| 1. | A and B | 2. | B and C |
| 3. | C and D | 4. | A and C |
Subtopic: Aromatic Hydrocarbons - Benzene - Structure, Preparation & Chemical Reactions |
72%
Level 2: 60%+
Hints
Which of the following alkenes undergo ozonolysis to produce a mixture of ketones only?
| a. |  |
b. |  |
| c. |  |
d. |  |
Choose the correct option:
| 1. | (a, b) | 2. | (b, c) |
| 3. | (c, d) | 4. | (a, c) |
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
91%
Level 1: 80%+
Hints
Some oxidation reactions of methane are given below. Which of them is/are controlled oxidation reactions?
| a. | CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) |
| b. | CH4(g) + O2(g) → C(s) + 2H2O(l) |
| c. | CH4(g) + O2(g) \(\xrightarrow[]{Mo_{2}O_{3}}\) HCHO + H2O |
| d. | 2CH4(g) + O2(g) \(\xrightarrow[]{Cu/523 \ K/ 100 \ atm}\)2CH3OH |
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
80%
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
| 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
| Assertion (A): | Toluene, on undergoing Friedel–Crafts methylation, yields a mixture of ortho- and para-xylene. |
| Reason (R): | The \(-\text{CH}_3\) group already present on the benzene ring in toluene increases electron density at the ortho and para positions, directing |
| 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
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 |
80%
Level 1: 80%+
Hints
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