Q. No.An electrophile among the following is -
1.
\(\mathrm{OH}^-\)
2.
\(\mathrm{NC}^-\)
3.
\(R_3C^-\)
4.
Carbonyl group
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The effect that can explain the given order of acidity of the carboxylic acids is-
Cl3CCOOH > Cl2CHCOOH > ClCH2COOH
1. +I effect
2. -I effect
3. +E effect
4. -E effect
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The purification method based on the difference in solubilities of the compound and the impurities in a solvent is -
1. Crystallisation
2. Distillation
3. Chromatography
4. Isolation
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The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapor in the vapor phase. A suitable method for the extraction of these oils from the flowers is
1. Distillation
2. Crystallisation
3. Distillation under pressure
4. Steam distillation
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During the hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. The technique that can give the best results is-
| 1. | Column chromatography | 2. | Solvent extraction |
| 3. | Distillation | 4. | Thin layer chromatography |
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The principle involved in paper chromatography is
1. Adsorption
2. Partition
3. Solubility
4. Volatility
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The correct order of decreasing stability of the following carbocations is:
| I | \( \begin{aligned} &~~~~~~~~~~~~\oplus\\ & CH_3 - CH-CH_3 \end{aligned}\) |
| II | \( \begin{aligned} &~~~~~~~~~~~~\oplus\\ & CH_3 - CH-OCH_3\end{aligned}\) |
| III | \( \begin{aligned} & ~~~~~~~~~~~~\oplus\\ &CH_3 - CH-CH_2- OCH_3\end{aligned}\) |
| 1. | II>I>III | 2. | I>II>III |
| 3. | II<I<III | 4. | I<II<III |
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