Q. No.Which is the correct IUPAC name for the given compound?
.
1. 2-Ethyl-3-methylpentane
2. 3,4-Dimethylhexane
3. 2-sec-Butylbutane
4. 2,3-Dimethylbutane
.
Which of the following carbon marked with asterisk is expected to have greatest positive charge?
| 1. | 2. | ||
| 3. | 4. |
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
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 the terms mentioned in Column-I with the terms in Column-II.
| Column-I (Term) | Column-II (Definition) | ||
| A. | Carbocation | (i) | Species that can receive a pair of electrons. |
| B. | Nucleophile | (ii) | Conjunction of electrons of \(C-H ~\sigma-\) bond with the empty p-orbital present in adjacent positively charged carbon. |
| C. | Hyperconjugation | (iii) | sp2 hybridised carbon with empty p-orbital. |
| D. | Electrophile | (iv) | Species that can donate a pair of electrons. |
| Options: | A | B | C | D |
| 1. | (iii) | (iv) | (ii) | (i) |
| 2. | (i) | (ii) | (iii) | (iv) |
| 3. | (i) | (iv) | (iii) | (ii) |
| 4. | (iv) | (i) | (iii) | (ii) |
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 |
Match the intermediates given in Column-I with their probable structure in Column-II.
|
Column-I |
Column-II |
||
| A. |
Free radical |
(i) |
Trigonal planar |
| B. |
Carbocation |
(ii) |
Pyramidal |
| C. |
Carbanion |
(iii) |
Linear |
| Options: | A | B | C |
| 1. | (i) | (i) | (ii) |
| 2. | (i) | (ii) | (iii) |
| 3. | (iii) | (i) | (ii) |
| 4. | (ii) | (i) | (iii) |
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