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Q. No.In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with \(\text{Fe}^{3+}\) due to the formation of:
1. \([\mathrm{Fe}(\mathrm{SCN})]^{2+} \)
2. \(\mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3 \cdot \mathrm{xH}_2 \mathrm{O} \)
3. \(\mathrm{NaSCN} \)
4. \(\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right]^{4-} \)
1. \([\mathrm{Fe}(\mathrm{SCN})]^{2+} \)
2. \(\mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3 \cdot \mathrm{xH}_2 \mathrm{O} \)
3. \(\mathrm{NaSCN} \)
4. \(\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right]^{4-} \)
Subtopic: Qualitative Analysis of Organic Compounds |
67%
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 |
69%
Level 2: 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 |
78%
Level 2: 60%+
NEET - 2023
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Given below are two statements:
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
Hints
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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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
Hints
Match each item in List-I with one in List-II and select the correct match from the codes given:
| List-I | List-II | ||
| (a) | Separation of aniline-water mixture | (i) | Fractional distillation |
| (b) | Separation of aniline-chloroform mixture | (ii) | Distillation under reduced pressure |
| (c) | Separation of glycerol from spent-lye | (iii) | Distillation |
| (d) | Separation of different fractions of crude oil | (iv) | Steam distillation |
Codes:
| (a) | (b) | (c) | (d) | |
| 1. | (i) | (iii) | (ii) | (iv) |
| 2. | (iv) | (i) | (iii) | (ii) |
| 3. | (iv) | (ii) | (iii) | (i) |
| 4. | (iv) | (iii) | (ii) | (i) |
Subtopic: Purification of Organic Compounds |
77%
Level 2: 60%+
NEET - 2022
Hints
What is the hybridization shown by C1 and C2 carbons, respectively in the given compound?
\(\mathrm{ OHC-CH=CH-{^2}CH_2-{^1}COOCH_3}\)
\(\mathrm{ OHC-CH=CH-{^2}CH_2-{^1}COOCH_3}\)
| 1. | sp2 and sp3 | 2. | sp2 and sp2 |
| 3. | sp3 and sp2 | 4. | sp3 and sp3 |
Subtopic: Hybridisation & Structure of Carbon Compounds |
67%
Level 2: 60%+
NEET - 2022
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Subtopic: Reaction Intermediates ; Preparation & Properties |
78%
Level 2: 60%+
NEET - 2022
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Subtopic: Structural Isomers |
68%
Level 2: 60%+
NEET - 2021
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