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Q. No.Arrange the following in increasing order of stability:
| (a) | \(\left(\mathrm{CH}_3\right)_2 \stackrel{\oplus}{\mathrm{C}}-\mathrm{CH}_2-\mathrm{CH}_3 \) | (b) | \(\left(\mathrm{CH}_3\right)_3 \stackrel{\oplus}{\mathrm{C}} \) |
| (c) | \(\left(\mathrm{CH}_3\right)_2 \stackrel{\oplus}{\mathrm{C}}\mathrm{H} \) | (d) | \( \text {CH}_3 \stackrel{\oplus}{\mathrm{C}}\mathrm{H}_2\) |
| (e) | \( \stackrel{\oplus}{\mathrm{C}}\mathrm{H}_3 \) | ||
| 1. | e < d < c < a < b | 2. | d < e < c < a < b |
| 3. | a < e < d < c < b | 4. | e < d < c < b < a |
Subtopic: Reaction Intermediates ; Preparation & Properties |
75%
Level 2: 60%+
NEET - 2013
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Select the correct option based on the statements below:
| Assertion (A): | Chlorine is an electron-withdrawing group, yet it exhibits ortho- and para-directing behavior in electrophilic aromatic substitution. |
| Reason (R): | Inductive effect of chlorine destabilises the intermediate carbocation formed during the electrophilic substitution, however due to the more pronounced resonance effect, the halogen stabilises the carbocation at ortho and para positions. |
| 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: Electron Displacement Effects |
78%
Level 2: 60%+
NEET - 2022
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The correct statement about the SN1 reaction is:
| 1. | 100 % racemisation. |
| 2. | Inversion more than retention leads to partial racemisation. |
| 3. | 100 % retention. |
| 4. | 100 % Inversion. |
Subtopic: Nucleophile & Electrophile |
65%
Level 2: 60%+
NEET - 2015
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Subtopic: Hybridisation & Structure of Carbon Compounds |
69%
Level 2: 60%+
NEET - 2015
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The correct statement regarding electrophile is :
| 1. | Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile |
| 2. | Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile |
| 3. | Electrophiles can be either neutral or positively charged species and can form a bond accepting a pair of electrons from a nucleophile |
| 4. | Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile |
Subtopic: Nucleophile & Electrophile |
84%
Level 1: 80%+
NEET - 2017
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The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Purification of Organic Compounds |
67%
Level 2: 60%+
NEET - 2022
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Hyperconjugation occurs among the following compounds:
| 1. | I only | 2. | II only |
| 3. | III only | 4. | I and III |
Subtopic: Electron Displacement Effects |
68%
Level 2: 60%+
NEET - 2015
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Two possible stereo-structures of CH3CHOH.COOH, that are optically active, called:
| 1. | Diastereomers | 2. | Atropisomers |
| 3. | Enantiomers | 4. | Mesomers |
Subtopic: Stereo Isomers |
80%
Level 1: 80%+
NEET - 2015
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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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The correct IUPAC name of the following compound is :
1. 6-Bromo-4-methyl-2-chlorohexan-4-ol
2. 1-Bromo-5-chloro-4-methylhexan-3-ol
3. 6-Bromo-2-chloro-4-methylhaxan-4-ol
4. 1-Bromo-4-methyl-5-chorohexan-3-ol
1. 6-Bromo-4-methyl-2-chlorohexan-4-ol
2. 1-Bromo-5-chloro-4-methylhexan-3-ol
3. 6-Bromo-2-chloro-4-methylhaxan-4-ol
4. 1-Bromo-4-methyl-5-chorohexan-3-ol
Subtopic: Nomenclature |
75%
Level 2: 60%+
NEET - 2022
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