Which one of the following alcohols reacts instantaneously with Lucas reagent?
| 1. |  |
| 2. |  |
| 3. |  |
| 4. | \(\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_2 \mathrm{OH}\) |
Subtopic: Alcohols: Preparation & Properties |
81%
Level 1: 80%+
NEET - 2024
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Given below are two statements :
1. Both Statement I and Statement II are incorrect.
2. Statement I is correct but Statement II is incorrect.
3. Statement I is incorrect but Statement II is correct.
4. Both Statement I and Statement II are correct.
| Statement I: | The boiling point of three isomeric pentanes follows the order, \(\small\text { n-Pentane }>\text { Isopentane }>\text { Neopentane }\) |
| Statement II: | When branching increases, the molecule attains the shape of sphere. This results in smaller surface area for contact, due to which the intermolecular forces between the spherical molecules are weak, thereby lowering the boiling point. |
1. Both Statement I and Statement II are incorrect.
2. Statement I is correct but Statement II is incorrect.
3. Statement I is incorrect but Statement II is correct.
4. Both Statement I and Statement II are correct.
Subtopic: Aliphatic Hydrocarbon- Physical Properties |
76%
Level 2: 60%+
NEET - 2024
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Given below are two statements:
| Statement I: | Aniline does not undergo Friedel-Crafts alkylation reaction. |
| Statement II: | Aniline cannot be prepared through Gabriel synthesis. |
| 1. | Both Statement I and Statement II are incorrect. |
| 2. | Statement I is correct and Statement II is incorrect. |
| 3. | Statement I is incorrect and Statement II is correct. |
| 4. | Both Statement I and Statement II are correct. |
Subtopic: Amines - Preparation & Properties | Identification of Primary, Secondary & Tertiary Amines |
68%
Level 2: 60%+
NEET - 2024
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The E° value for the Mn3+/Mn2+ couple is more positive than that of Cr3+/Cr2+ or Fe3+/Fe2+ due to change of:
| 1. | d5 to d2 configuration | 2. | d4 to d5 configuration |
| 3. | d3 to d5 configuration | 4. | d5 to d4 configuration |
Subtopic: d-Block Elements- Properties & Uses |
71%
Level 2: 60%+
NEET - 2024
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On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as:
| 1. | Sublimation | 2. | Distillation |
| 3. | Chromatography | 4. | Crystallization |
Subtopic: Qualitative Analysis of Organic Compounds |
82%
Level 1: 80%+
NEET - 2024
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Which solution is part of Fehling solution 'A' (used in tests for reducing sugars and aldehydes)?
| 1. | Alkaline copper sulphate |
| 2. | Alkaline solution of sodium potassium tartrate (Rochelle's salt) |
| 3. | Aqueous sodium citrate |
| 4. | Aqueous copper sulphate |
Subtopic: Aldehydes & Ketones: Preparation & Properties |
59%
Level 3: 35%-60%
NEET - 2024
Hints
Match List-I with List-II.
Choose the correct answer from the options given below:
| List-I (Molecule) |
List-II
(Number and types of bond/s between two carbon atoms)
|
||
| A. | Ethane | I. | \(\small{\mathrm{One ~\sigma-bond~ and~ Two~ \pi-bonds}}\) |
| B. | Ethene | II. | \(\text { Two } \pi \text {-bonds }\) |
| C. | Carbon molecule, \(\mathrm{C} _2\) |
III. | \(\text { One } \sigma \text {-bond }\) |
| D. | Ethyne | IV. | \(\small{\mathrm{One ~\sigma-bond ~and ~One~ \pi-bond}}\) |
| 1. | A-IV, B-III, C-II, D-I | 2. | A-III, B-IV, C-II, D-I |
| 3. | A-III, B-IV, C-I, D-II | 4. | A-I, B-IV, C-II, D-III |
Subtopic: Hybridisation & Structure of Carbon Compounds |
75%
Level 2: 60%+
NEET - 2024
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Subtopic: van der Waal Force & Hydrogen Bonding |
73%
Level 2: 60%+
NEET - 2024
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Which of the following contains the highest number of helium atoms?
1. 4 u of helium
2. 4 g of helium
3. 2.27 L of helium at STP
4. 4 mol of helium
1. 4 u of helium
2. 4 g of helium
3. 2.27 L of helium at STP
4. 4 mol of helium
Subtopic: Moles, Atoms & Electrons |
77%
Level 2: 60%+
NEET - 2024
Hints
Match the redox conversions in List-I with the corresponding number of Faradays required in List-II.
Choose the correct answer from the options given below:
| List-I (Redox Conversion) |
List-II (Number of Faraday required) |
||
| A. | 1 mol of H2O to O2 | I. | 3F |
| B. | 1 mol of \(MnO^-_4\) to \(Mn^{2+}\) | II. | 2F |
| C. | 1.5 mol of \(Ca\) from molten \(CaCl_2\) | III. | 1F |
| D. | 1 mol of FeO to Fe2O3 | IV. | 5F |
Choose the correct answer from the options given below:
| 1. | A - III, B - IV, C - I, D - II | 2. | A - II, B - III, C - I, D - IV |
| 3. | A - III, B - IV, C - II, D - I | 4. | A - II, B - IV, C - I, D - III |
Subtopic: Faraday’s Law of Electrolysis |
66%
Level 2: 60%+
NEET - 2024
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