Q. No.
The addition of HCl to an alkene proceeds in two steps. The first step is the attack of H+ ion on the double bond portion. The same can be shown as-
| 1. |  |
2. |  |
| 3. |  |
4. | All of these are possible |
Match the type of mixture of compounds in Column I with the technique of separation/purification given in column II.
| Column I | Column II |
| A. Two solids which have different solubilities in a solvent and which do not undergo a reaction when dissolved in it | 1. Steam distillation |
| B. Liquid that decomposes at its boiling point | 2. Fractional distillation |
| C. Steam volatile liquid | 3. Crystallisation |
| D. Two liquids that have boiling points close to each other | 4. Distillation under reduced pressure |
Codes:
| A | B | C | D | |
| 1. | 3 | 4 | 1 | 2 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
Match Column I with Column II.
| Column I | Column II | ||
| A. | Dumas method | 1. | AgNO3 |
| B. | Kjeldahl’s method | 2. | Silica gel |
| C. | Carius method | 3. | Nitrogen gel |
| D. | Chromatography | 4. | Ammonium sulphate |
Choose the correct answer from the options given below:
| A | B | C | D | |
| 1. | 3 | 4 | 1 | 2 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
Electrophilic addition reactions proceed in two steps. The first step involves the addition of an electrophile. The major intermediate formed in the first step is:
\(\mathrm{H}_3 \mathrm{C}-\mathrm{HC}=\mathrm{CH}_2+\mathrm{H}^{+} \rightarrow \text { ? }\)
1. carbanion
2. carbocation
3. carbocation
4. carbanion
Which of the following carbon marked with asterisk is expected to have greatest positive charge?
| 1. | 2. | ||
| 3. | 4. |
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 |
Paper chromatography operates based on which of the following principles?
1. Adsorption
2. Partition
3. Solubility
4. Volatility
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. Which technique is most effective in providing the best results?
| 1. | Column chromatography | 2. | Solvent extraction |
| 3. | Distillation | 4. | Thin layer chromatography |
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