Q. No.Select the correct option based on statements below:
| Assertion (A): | Vinyl chloride can be easily hydrolyzed. |
| Reason (R): | Resonance is not observed in vinyl chloride. |
| 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: Chemical Properties |
63%
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Match the items in Column I and Column II.
| Column l | Column ll |
| A. SN1 reaction | 1. Vic-dibromide |
| B. Elimination of HX from an alkyl halide | 2. Chlorobromocarbons |
| C. Bromination of alkenes | 3. Racemisation |
| D. Chemicals in fire extinguisher | 4. Saytzeff rule |
Codes:
| A | B | C | D | |
| 1. | 2 | 3 | 4 | 1 |
| 2. | 3 | 4 | 1 | 2 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
Subtopic: Chemical Properties |
88%
From NCERT
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Match the reactions given in Column I with the types of reactions given in Column II and mark the appropriate option.
| Column-I | Column-II | ||
| A. |  |
(i) | Nucleophilic aromatic substitution reaction |
| B. |  |
(ii) | Electrophilic aromatic substitution |
| C. |  |
(iii) | Saytzeff elimination |
| D |  |
(iv) | Electrophilic addition |
| (v) | Nucleophilic substitution reaction |
Codes:
| A | B | C | D | |
| 1. | (ii) | (iv) | (v) | (i) |
| 2. | (iii) | (i) | (v) | (ii) |
| 3. | (v) | (iv) | (iii) | (ii) |
| 4. | (iv) | (v) | (iii) | (ii) |
Subtopic: Chemical Properties |
75%
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The correct match of column I (Reactions) with column II (Name of reactions) is:
| Column I | Column II | ||
| A. |  |
1. | Fittig reaction |
| B. |  |
2. | Wurtz-Fittig reaction |
| C. |  |
3. | Finkelstein reaction |
| D. |  |
4. | Sandmeyer reaction |
Codes:
| A | B | C | D | |
| 1. | 2 | 1 | 4 | 3 |
| 2. | 3 | 1 | 4 | 2 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
Subtopic: Chemical Properties |
92%
From NCERT
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Select the correct option based on statements below:
| Assertion (A): | Phosphorus chlorides (tri and Penta) are preferred over thionyl chloride for the preparation of alkyl chlorides from alcohols. |
| Reason (R): | Phosphorus chlorides give pure alkyl halides. |
| 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: Chemical Properties |
72%
From NCERT
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Consider the given two statements:
| Assertion (A): | KCN reacts with methyl chloride to give methyl isocyanide. |
| Reason (R): | \(CN^-\) is an ambident nucleophile. |
| 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: Chemical Properties |
75%
From NCERT
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Given below are two statements:
| Assertion (A): | tert-Butyl bromide undergoes Wurtz reaction to give 2,2,3,3-tetramethylbutane. |
| Reason (R): | In Wurtz reaction, primary alkyl halides react with sodium in dry ether to give hydrocarbon containing double the number of carbon atoms present in the halide. |
| 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: Chemical Properties |
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Given below are two statements:
| Assertion (A): | It is difficult to replace chlorine by -OH in chlorobenzene in comparison to that in chloroethane. |
| Reason (R): | Chlorine carbon (C—Cl) bond in chlorobenzene has a partial double bond character 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. | (A) is False but (R) is True. |
Subtopic: Chemical Properties | Haloarenes: Directive Influence of Halogen |
92%
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The statements regarding the reaction intermediate are given below.
| i. | Intermediate (c) is unstable because in this carbon is attached to 5 atoms. |
| ii. | Intermediate (c) is unstable because carbon atom is sp2 hybridised. |
| iii. | Intermediate (c) is stable because carbon atom is sp2 hybridised. |
| iv. | Intermediate (c) is less stable than the reactant (b). |
The correct statements are:
1. (i, ii)
2. (ii, iii)
3. (iii, iv)
4. (i, iv)
Subtopic: Mechanism of Reactions | Chemical Properties |
74%
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Which of the following statements are correct about the mechanism of this reaction?
| (i) | A carbocation will be formed as an intermediate in the reaction. |
| (ii) | OH– will attach the substrate (b) from one side and Cl– will leave it simultaneously from other side. |
| (iii) | An unstable intermediate will be formed in which OH– and Cl– will be attached by weak bonds. |
| (iv) | Reaction proceeds through SN1 mechanism |
Choose the correct option
1. (i, ii)
2. (ii, iii)
3. (iii, iv)
4. (i, iv)
Subtopic: Mechanism of Reactions | Chemical Properties |
70%
From NCERT
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