Q. No.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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Which among the given molecules can exhibit tautomerism?
1. III only
2. Both I and III
3. Both I and II
4. Both II and III
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With respect to the conformers of ethane, which of the following statements is true?
| 1. | Bond angle changes but bond length remains the same |
| 2. | Both bond angle and bond length change |
| 3. | Both bond angle and bond length remain the same |
| 4. | Bond angle remains the same but the bond length changes |
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