Q. No.Which of the following carbon atoms is most electronegative?
1. III
2. II
3. I
4. All are equally electronegative
Which of the following groups has the highest + I effect?
1. CH3 —
2. CH3CH2 —
3. (CH3)2CH —
4. (CH3)3C —
The correct order of stability of following carbocation is-
| 1. | b > a > c | 2. | a > c > b |
| 3. | a > b > c | 4. | c > b > a |
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The maximum -I effect exerted by the group is:
1. \(C_6H_5-\)
2. \(-OCH_3\)
3. \(-Cl\)
4. \(-NO_2\)
Which pair of groups exerts a (\( - I \)) effect?
\(1 . -NO_{2} ~~ \&~~~ - CH_{3}\)
\(2 . - NO_{2} ~~ \& - Cl\)
\(3 . - Cl ~~ \& -CH_{3}\)
\(4 . - CH_{3} ~~~~ \& ~ - C_{2} H_{5}\)
Carbocations are important intermediates in organic reactions, they are often stabilized by resonance, inductive effect, and hyperconjugation. The cation among the following that cannot be stabilized by resonance is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
| 1. | \(CH_3CH_2\overset{+~~~~~}{CH}_2>CH_2=CH-\overset{+~~~~~}{CH}_2> \\ CH_2=CH\overset{+~~~~~}{CH}CH_3>CH_2=CH\overset{+}{C}(CH_3)_2 \) |
| 2. | \(CH_2=CH\overset{+~~}{CH}_2>CH_3CH_2\overset{+~~~~~}{CH}_2>\\CH_2=CH\overset{+~~}{C}(CH_3)_2>CH_2=CH\overset{+~~~~~}{CH}CH_3 \) |
| 3. | \(CH_2=CH\overset{+~}{C}(CH_3)_2>CH_2=CH\overset{+~}{C}HCH_3>\\CH_2=CH\overset{+~~~~~}{CH}_2>CH_3CH_2\overset{+~~~~~}{CH}_2 \) |
| 4. | \(CH_2=CH-\overset{+~~~~~}{CH}CH_3>CH_2=CH\overset{+~~}{C}(CH_3)_2>\\CH_3CH_2-\overset{+~~~~~}{CH}_2>CH_2=CH\overset{+~~~~~}{CH}_2 \) |
Which of the following statements about the inductive effect is correct?
| 1. | The inductive effect transfers electrons from one carbon atom to another. |
| 2. | The inductive effect operates in both \(\sigma\)- and \(\pi\)-bonds. |
| 3. | The inductive effect does not create any charge in the molecule. |
| 4. | The inductive effect creates partial charges and is distance-dependent. |
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| 1. | Free radicals, carbonium ions, or carbanions are reaction intermediates. |
| 2. | The reaction between methane and chlorine in the presence of sunlight proceeds via free radicals. |
| 3. | The electronegative atom in the carbon chain produces the +I effect. |
| 4. | Homolytic fission of C-C bonds gives free radicals. |
Which of the following explains the greater stability of 2,3-dimethylbut-2-ene compared to 2-butene?
1. Resonance
2. Hyperconjugation
3. Electromeric effect
4. Inductive effect
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