- 1(current)
Q. No.A nucleophile is a species that should have:
| (a) | A pair of electrons to donate |
| (b) | Positive charge |
| (c) | Negative charge |
| (d) | Electron-deficient species |
Choose the correct option:
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)
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Which of the following is correct statement regarding an electrophile ?
| 1. | Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile. |
| 2. | Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile. |
| 3. | Electrophile can be either a neutral or positively charged species and can form a bond accepting a pair of electrons from a nucleophile. |
| 4. | Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile |
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1. Electrophiles are electron-seeking species.
2. Electrophiles are Lewis acids.
3. \(\text{SO}_3\) is an electrophile.
4. Electrophiles are Lewis bases.
1. \(\mathrm{CN}^{-}\)
2. \(\mathrm{AlCl}_3\)
3. \(\mathrm{H}_2 \mathrm{O}\)
4. \(^-{\mathrm{O}} \mathrm{CH}_3\)
(CH3)4N+ is neither an electrophile nor a nucleophile because of it:
| 1. | Does not have an electron pair for donation and it also cannot attract an electron pair. |
| 2. | Neither has an electron pair available for donation nor can accommodate electrons since all shells of N are fully occupied. |
| 3. | Can act as Lewis acid and base. |
| 4. | None of the above. |
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Which of the following represents a set of nucleophiles?
| 1. | \(\mathrm{BF}_3, \mathrm{H}_2 \mathrm{O}, \mathrm{NH}_{2}^{-}\) | 2. | \(\mathrm{AlCl}_3, \mathrm{BF}_3, \mathrm{NH_3}\) |
| 3. | \(\mathrm{CN}^{-}, \mathrm{RCH}_2^{-}, \mathrm{ROH}\) | 4. | \(\mathrm{H}^{+}, \mathrm{RNH}_3^{+}, \mathrm{CCl}_2 \) |
1. \(H^+, NH_3, Cl^-\)
2. \(BF_3,H_2O,NH_3\)
3. \(AlCl_3, BF_3,NH_3\)
4. \(CN^-,H_2O,R-OH\)
- 1(current)
Q. No.
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