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Q. No.The product \(\mathrm{Z}\) formed in the series of given reactions is:
\(\text { n-Hexane } \xrightarrow[10-20 \mathrm{~atm}]{\mathrm{Cr}_2 \mathrm{O}_3/\mathrm{Al}_2\mathrm O_3, 773 \mathrm{~K}} \mathrm{Y} \xrightarrow[373 \mathrm{~K}]{\text { Fuming } \mathrm{H}_2 \mathrm{SO}_4} \mathrm{Z}\)
1. Benzene
2. Benzene sulphonic acid
3. Nitrobenzene
4. Toluene
\(\text { n-Hexane } \xrightarrow[10-20 \mathrm{~atm}]{\mathrm{Cr}_2 \mathrm{O}_3/\mathrm{Al}_2\mathrm O_3, 773 \mathrm{~K}} \mathrm{Y} \xrightarrow[373 \mathrm{~K}]{\text { Fuming } \mathrm{H}_2 \mathrm{SO}_4} \mathrm{Z}\)
1. Benzene
2. Benzene sulphonic acid
3. Nitrobenzene
4. Toluene
Subtopic: Aromatic Hydrocarbons - Reactions & Mechanism |
91%
Level 1: 80%+
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| 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 |
89%
Level 1: 80%+
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Matching the following:
| List-I (Compound) | List-II (Characteristics) | ||
| a. | Benzene | (i) | Phosgene |
| b. | Ethylene | (ii) | Silver mirror |
| c. | Acetaldehyde | (iii) | Mustard gas |
| d. | Chloroform | (iv) | (4n+2)π -electron |
| (a) | (b) | (c) | (d) | |
| 1. | (iv) | (iii) | (i) | (ii) |
| 2. | (iv) | (iii) | (ii) | (i) |
| 3. | (iii) | (iv) | (ii) | (i) |
| 4. | (ii) | (i) | (iv) | (iii) |
Subtopic: Aromatic Hydrocarbons - Reactions & Mechanism |
85%
Level 1: 80%+
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The product 'Z' formed in the following sequential reaction is:
\(\mathrm{Phenol\xrightarrow{Zn~dust}X\xrightarrow[anhyd.~AlCl_3]{CH_3Cl}Y\xrightarrow{alkaline~KMnO_4}Z}\)
1. Benzaldehyde
2. Benzoic acid
3. Benzene
4. Toluene
\(\mathrm{Phenol\xrightarrow{Zn~dust}X\xrightarrow[anhyd.~AlCl_3]{CH_3Cl}Y\xrightarrow{alkaline~KMnO_4}Z}\)
1. Benzaldehyde
2. Benzoic acid
3. Benzene
4. Toluene
Subtopic: Aromatic Hydrocarbons - Reactions & Mechanism |
84%
Level 1: 80%+
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On mixing a certain alkane with chlorine and irradiating it with ultraviolet light, it forms only one monochloroalkane.
Identify the possible alkane:
1. Propane
2. Pentane
3. Isopentane
4. Neopentane
Subtopic: Aromatic Hydrocarbons - Reactions & Mechanism |
81%
Level 1: 80%+
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The incorrect statement about the nitration of benzene is:
| 1. | \(\stackrel{+}{\mathrm{N}} \mathrm{O}_2\) acts as an electrophile. |
| 2. | H2SO4 acts as an acid and HNO3 acts as a base. |
| 3. | Nitration is an electrophilic substitution reaction. |
| 4. | Nitro group has \(+I\) effect in directing substituents. |
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties | Aromatic Hydrocarbons - Reactions & Mechanism |
84%
Level 1: 80%+
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Which species acts as an electrophile during the nitration of benzene?
| 1. | \( \mathrm{NO}_3^{-} \) | 2. | \(\mathrm{NO}_2^{-} \) |
| 3. | \(\mathrm{NO}_2^{+} \) | 4. | \(\mathrm{HNO}_3\) |
Subtopic: Aromatic Hydrocarbons - Reactions & Mechanism |
85%
Level 1: 80%+
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Q. No.
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