Q. No.
Which of the following is the most correct electron displacement for a nucleophilic reaction to take place?
1.
2.
3.
4.
| 1. | |
| 2. | |
| 3. | |
| 4. | |
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2. 18.20
3. 16.76
4. 15.76
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Two possible stereo-structures of CH3CHOH.COOH, which are optically active, are called:
1. Diastereomers
2. Atropisomers
3. Enantiomers
4. Mesomers
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Which of the following statements is not correct for a nucleophile?
| 1. | Nucleophile is a lewis acid. |
| 2. | Ammonia is a nucleophile. |
| 3. | Nucleophiles attack low electron density sites. |
| 4. | Nucleophiles are not electron-seeking. |
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2. sp2
3. sp
4. 2p
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2. The eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain
3. The staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain
4. The staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain
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(i) CH3CH2CH2Br + KOH
CH3CH=CH2 + KBr + H2O (ii)
(iii)
Which of the following statements is correct?
2. (i) is elimination, (ii) and (iii) are substitution reactions
3. (i) is substitution, (ii) and (iii) are addition reactions
4. (i) and (ii) are elimination reactions and (iii) is addition reaction
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(R= alkyl)
| 1. | Both b and d | 2. | Both a and c |
| 3. | Both a and b | 4. | Both d and a |
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