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Q. No.Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae:
1. \(Fe_3[Fe(CN)_6]_2\)
2. \(Fe_4[Fe(CN)_6]_3\)
3. \(Fe_4[Fe(CN)_6]_2\)
4. \(Fe_3[Fe(CN)_6]_3\)
Subtopic: Qualitative Analysis of Organic Compounds |
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NEET - 2013
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\(CH_3-CH_3, \ CH_3-CH_2-CH_3, \ \)
\(\left(CH_3\right)_2 CH-CH_3, \) and \(CH_3-CH_2-CH\left(CH_3\right)_2 \)
The increasing order of stability of the free radicals formed from homolytic fission of the above three alkanes is:
| 1. | \(\begin{aligned} & (CH_3)_2 \dot{C}-CH_2 CH_3<CH_3-\dot{C} H-CH_3 \\ & <CH_3-\dot{C} H_2<(CH_3)_3 \dot{C} & \\ \end{aligned}\) |
| 2. | \( \begin{aligned} &CH_3-\dot{C} H_2<CH_3-\dot{C} H-CH_3 \\ & <\left(CH_3\right)_2 \dot{C}-CH_2 CH_3<\left(CH_3\right)_3 \dot{C}\end{aligned}\) |
| 3. | \(\begin{aligned} & CH_3-\dot{C} H_2<CH_3-\dot{C} H-CH_3\\ &<\left(CH_3\right)_3 \dot{C}<\left(CH_3\right)_2 \dot{C}-CH_2 CH_3 \end{aligned}\) |
| 4. | \(\begin{aligned} & \left(CH_3\right)_3 \dot{C}<\left(CH_3\right)_2 \dot{C}-CH_2-CH_3 \\ &<CH_3-\dot{C} H-CH_3<CH_3-\dot{C} H_2 \end{aligned}\) |
Subtopic: Reaction Intermediates ; Preparation & Properties |
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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 |
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Subtopic: Aromaticity & Polarity |
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is:
Subtopic: Hybridisation & Structure of Carbon Compounds |
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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 |
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Given:
I and II are classified as:
1. Identical
2. A pair of conformers
3. A pair of geometrical isomers
4. A pair of optical isomers
 |
 |
| I | II |
1. Identical
2. A pair of conformers
3. A pair of geometrical isomers
4. A pair of optical isomers
Subtopic: Conformational Isomers |
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The IUPAC name of the above-mentioned compound is:
1. cis-2-Chloro-3-iodo-2-pentene
2. trans-2-Chloro-3-iodo-2-pentene
3. cis-3-Iodo-4-chloro-3-pentene
4. trans-3-Iodo-4-chloro-3-pentene
Subtopic: Nomenclature |
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Subtopic: Nucleophile & Electrophile |
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AIPMT - 2010
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The IUPAC name of CH3CH=CHC≡CH is:
1. Pent - 3 - en - 1 - yne
2. Pent - 2 - en - 4 - yne
3. Pent - 1 - yn - 3 - ene
4. Pent - 4 - yn - 2 – ene
Subtopic: Nomenclature |
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AIPMT - 2010
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