Given below are two statements:
Assertion (A):
Simple distillation can help in separating a mixture of propan-1-ol (boiling point 97°C ) and propanone (boiling point 56°C ).
Reason (R):
Liquids with a difference of more than 20°C in their boiling points can be separated by simple distillation.
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: Qualitative Analysis of Organic Compounds |
85%
From NCERT
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Given below are two statements:
| Assertion (A): | Energy of resonance hybrid is equal to the average of energies of all canonical forms. |
| Reason (R): | Resonance hybrid cannot be presented by a single structure. |
| 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: Aromaticity & Polarity |
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Given below are two statements:
| Assertion (A): | Pent-1-ene and pent-2-ene are position isomers. |
| Reason (R): | Position isomers differ in the position of a functional group or a substituent. |
| 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: Structural Isomers |
87%
From NCERT
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Given below are two statements:
| Assertion (A): | All the carbon atoms in H2C = C = CH2 are sp2-hybridised. |
| Reason (R): | In this molecule, all the carbon atoms are attached to each other by double bonds. |
| 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: Hybridisation & Structure of Carbon Compounds |
68%
From NCERT
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Given below are two statements:
| Assertion (A): | Sulphur present in an organic compound can be estimated quantitatively by the Carius method. |
| Reason (R): | Sulphur is separated easily from other atoms in the molecule and gets precipitated as a light yellow solid. |
| 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: Quantitative Analysis of Organic Compounds |
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Given below are two statements:
| Assertion (A): | Components of a mixture of red and blue inks can be separated by distributing the components between stationary and mobile phases in paper chromatography. |
| Reason (R): | The colored components of inks migrate at different rates because paper selectively retains different components according to the difference in their partition between the two phases. |
| 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: Purification of Organic Compounds |
85%
From NCERT
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Match Column I with Column II.
| Column I | Column II | ||
| A. | Dumas method | 1. | AgNO3 |
| B. | Kjeldahl’s method | 2. | Silica gel |
| C. | Carius method | 3. | Nitrogen gel |
| D. | Chromatography | 4. | Ammonium sulphate |
Choose the correct answer from the options given below:
| A | B | C | D | |
| 1. | 3 | 4 | 1 | 2 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
Subtopic: Quantitative Analysis of Organic Compounds |
75%
From NCERT
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Match the terms mentioned in Column-I with the terms in Column-II.
| Column-I (Term) | Column-II (Definition) | ||
| A. | Carbocation | (i) | Species that can receive a pair of electrons. |
| B. | Nucleophile | (ii) | Conjunction of electrons of \(C-H ~\sigma-\) bond with the empty p-orbital present in adjacent positively charged carbon. |
| C. | Hyperconjugation | (iii) | sp2 hybridised carbon with empty p-orbital. |
| D. | Electrophile | (iv) | Species that can donate a pair of electrons. |
| Options: | A | B | C | D |
| 1. | (iii) | (iv) | (ii) | (i) |
| 2. | (i) | (ii) | (iii) | (iv) |
| 3. | (i) | (iv) | (iii) | (ii) |
| 4. | (iv) | (i) | (iii) | (ii) |
Subtopic: Hybridisation & Structure of Carbon Compounds |
82%
From NCERT
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Subtopic: Electron Displacement Effects |
81%
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The correct order of decreasing stability of the following carbocations is:
| I | \( \begin{aligned} &~~~~~~~~~~~~\oplus\\ & CH_3 - CH-CH_3 \end{aligned}\) |
| II | \( \begin{aligned} &~~~~~~~~~~~~\oplus\\ & CH_3 - CH-OCH_3\end{aligned}\) |
| III | \( \begin{aligned} & ~~~~~~~~~~~~\oplus\\ &CH_3 - CH-CH_2- OCH_3\end{aligned}\) |
| 1. | II > I > III | 2. | I > II > III |
| 3. | II < I < III | 4. | I < II < III |
Subtopic: Electron Displacement Effects |
58%
From NCERT
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