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Q. No.A pair of carbocations that has a more stable second carbocation than the first is :
1.
2.
3.
4.
Subtopic: Electron Displacement Effects |
56%
Level 3: 35%-60%
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Which of the following characteristics correctly describes the differences between structural (constitutional) isomers?
1. I only
2. II and III only
3. I and III only
4. I, II, and III
| I: | These compounds may have different carbon skeletons. |
| II: | Chemical properties are altered due to the differences in functional groups. |
| III: | Functional groups may occupy different positions on the carbon skeleton. |
1. I only
2. II and III only
3. I and III only
4. I, II, and III
Subtopic: Structural Isomers |
67%
Level 2: 60%+
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Which of the following functional groups are present in phenylalanine?
1. Alkyl, double bond, and aromatic ring.
2. Amine, and carboxylic acid.
3. Double bond, amide and alcohol.
4. Aromatic ring, halide and ketone.
1. Alkyl, double bond, and aromatic ring.
2. Amine, and carboxylic acid.
3. Double bond, amide and alcohol.
4. Aromatic ring, halide and ketone.
Subtopic: Nomenclature |
93%
Level 1: 80%+
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Given below are two statements:
In the light of the above statements, choose the correct answer from the options given below:
1. Statement I is true but Statement II is false.
2. Statement I is false but Statement II is true
3. Both Statement I and Statement II are true.
4. Both Statement I and Statement II are false.
| Statement I: | In an organic compound, when inductive and electromeric effects operate in opposite directions, the inductive effect predominates. |
| Statement II: | Hyperconjugation is observed in o-xylene. |
1. Statement I is true but Statement II is false.
2. Statement I is false but Statement II is true
3. Both Statement I and Statement II are true.
4. Both Statement I and Statement II are false.
Subtopic: Electron Displacement Effects |
Level 3: 35%-60%
NEET - 2023
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Match List -I with List-II :
Choose the correct answer from the options given below
| List-I (Mixtures/Sample) |
List-II (Technique used for purification) |
||
| A. | Glycerol from spent lye | (I) | Steam distillation |
| B. | Chloroform + Aniline | (II) | Fractional distillation |
| C. | Fractions of crude oil | (III) | Distillation under reduced pressure |
| D. | Aniline+water | (IV) | Distillation |
Choose the correct answer from the options given below
| Options: | (A) | (B) | (C) | (D) |
| 1. | III | IV | II | I |
| 2. | IV | II | I | III |
| 3. | I | II | III | IV |
| 4. | I | III | II | IV |
Subtopic: Purification of Organic Compounds |
75%
Level 2: 60%+
NEET - 2023
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The number of \(\sigma\) bonds, \(\pi\) bonds and lone pair of electrons in pyridine respectively are:
1. 12, 2, 1
2. 11, 2, 0
3. 12, 3, 0
4. 11, 3, 1
1. 12, 2, 1
2. 11, 2, 0
3. 12, 3, 0
4. 11, 3, 1
Subtopic: Hybridisation & Structure of Carbon Compounds |
68%
Level 2: 60%+
NEET - 2023
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The curved arrow shows an electron movement:
1. Towards a nucleophile
2. Towards an electrophile
3. Away from an electrophile
4. In either direction
1. Towards a nucleophile
2. Towards an electrophile
3. Away from an electrophile
4. In either direction
Subtopic: Bond Cleavage & Isomerism |
69%
Level 2: 60%+
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Subtopic: Structural Isomers |
80%
Level 1: 80%+
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Subtopic: Electron Displacement Effects |
82%
Level 1: 80%+
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The outer orbitals of C in an ethene molecule can be considered to be hybridized to given three equivalent sp2 orbitals. The total number of sigma (\(\sigma\)) and pi(\(\pi\)) bonds in ethene molecule are:
1. 3 sigma (\(\sigma\)) and 2 pi(\(\pi\)) bonds
2. 4 sigma (\(\sigma\)) and 1 pi(\(\pi\)) bonds
3. 5 sigma (\(\sigma\)) and 1 pi(\(\pi\)) bonds
4. 1 sigma (\(\sigma\)) and 2 pi(\(\pi\)) bonds
1. 3 sigma (\(\sigma\)) and 2 pi(\(\pi\)) bonds
2. 4 sigma (\(\sigma\)) and 1 pi(\(\pi\)) bonds
3. 5 sigma (\(\sigma\)) and 1 pi(\(\pi\)) bonds
4. 1 sigma (\(\sigma\)) and 2 pi(\(\pi\)) bonds
Subtopic: Hybridisation & Structure of Carbon Compounds |
85%
Level 1: 80%+
NEET - 2013
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