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Q. No.The technique in which the liquid boils, when the sum of vapour pressure due to organic liquid \((P_1)\) and that due to water \((P_2)\) becomes equal to the atmospheric pressure (P), is:
1. Sublimation
2. Fractional distillation
3. Steam distillation
4. Evaporation
Subtopic: Purification of Organic Compounds |
74%
Level 2: 60%+
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Ammonium molybdate is the reagent used to detect:
1. Nitrogen as nitrate
2. Phosphorous as phosphate
3. Sulphur as sulphate
4. Iodine as iodate
1. Nitrogen as nitrate
2. Phosphorous as phosphate
3. Sulphur as sulphate
4. Iodine as iodate
Subtopic: Qualitative Analysis of Organic Compounds |
78%
Level 2: 60%+
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How many hydrogens are involved in hyperconjugation in the given organic compound A?
| 1. | 12 | 2. | 13 |
| 3. | 15 | 4. | 16 |
Subtopic: Electron Displacement Effects |
57%
Level 3: 35%-60%
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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 |
63%
Level 2: 60%+
NEET - 2013
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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 |
75%
Level 2: 60%+
NEET - 2013
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is:
Subtopic: Hybridisation & Structure of Carbon Compounds |
84%
Level 1: 80%+
NEET - 2013
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Subtopic: Aromaticity & Polarity |
84%
Level 1: 80%+
NEET - 2013
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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. \(\mathrm{Fe_3[Fe(CN)_6]_2}\)
2. \(\mathrm{Fe_4[Fe(CN)_6]_3}\)
3. \(\mathrm{Fe_4[Fe(CN)_6]_2}\)
4. \(\mathrm{Fe_3[Fe(CN)_6]_3}\)
1. \(\mathrm{Fe_3[Fe(CN)_6]_2}\)
2. \(\mathrm{Fe_4[Fe(CN)_6]_3}\)
3. \(\mathrm{Fe_4[Fe(CN)_6]_2}\)
4. \(\mathrm{Fe_3[Fe(CN)_6]_3}\)
Subtopic: Qualitative Analysis of Organic Compounds |
76%
Level 2: 60%+
NEET - 2013
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\(\mathrm{CH_3-CH_3, \ CH_3-CH_2-CH_3, \ }\)
\(\mathrm{\left(CH_3\right)_2 CH-CH_3, }\) and \(\mathrm{CH_3-CH_2-CH\left(CH_3\right)_2 }\)
The increasing order of stability of the free radicals formed from homolytic fission of the above three alkanes is:
| 1. | \(\mathrm{ (CH_3)_2 \dot{C}-CH_2 CH_3<CH_3-\dot{C} H-CH_3 \\ <CH_3-\dot{C} H_2<(CH_3)_3 \dot{C} }\) |
| 2. | \( \mathrm{CH_3-\dot{C} H_2<CH_3-\dot{C} H-CH_3 \\ <\left(CH_3\right)_2 \dot{C}-CH_2 CH_3<\left(CH_3\right)_3 \dot{C}}\) |
| 3. | \(\mathrm{CH_3-\dot{C} H_2<CH_3-\dot{C} H-CH_3\\ <\left(CH_3\right)_3 \dot{C}<\left(CH_3\right)_2 \dot{C}-CH_2 CH_3 }\) |
| 4. | \(\mathrm{ \left(CH_3\right)_3 \dot{C}<\left(CH_3\right)_2 \dot{C}-CH_2-CH_3 \\ <CH_3-\dot{C} H-CH_3<CH_3-\dot{C} H_2 }\) |
Subtopic: Reaction Intermediates ; Preparation & Properties |
79%
Level 2: 60%+
NEET - 2013
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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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