Which of the following carbon atoms is most electronegative?

 

1.  III

2.  II

3.  I

4.  All are equally electronegative   

Subtopic:  Hybridisation & Structure of Carbon Compounds | Electron Displacement Effects |
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Which of the following groups has the highest + I effect?

1. CH3

2. CH3CH2

3. (CH3)2CH —

4. (CH3)3C —

Subtopic:  Electron Displacement Effects |
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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
Subtopic:  Electron Displacement Effects | Reaction Intermediates ; Preparation & Properties |
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The maximum -I effect exerted by the group is:

1. \(C_6H_5-\)

2. \(-OCH_3\)

3. \(-Cl\)

4. \(-NO_2\)

Subtopic:  Electron Displacement Effects |
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Which pair of groups exerts a (\( - I \)) effect?

\(1 .   -NO_{2} ~~  \&~~~   - CH_{3}\)
\(2 .   - NO_{2}  ~~ \&   - Cl\)
\(3 .   - Cl  ~~ \&   -CH_{3}\)
\(4 .   - CH_{3}  ~~~~ \&  ~ - C_{2} H_{5}\)

Subtopic:  Electron Displacement Effects |
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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.
Subtopic:  Electron Displacement Effects |
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The correct order of stability of the following carbocations is:
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. \(CH_2=CH-\overset{+~~~~~}{CH}CH_3>CH_2=CH\overset{+~~}{C}(CH_3)_2>\\CH_3CH_2-\overset{+~~~~~}{CH}_2>CH_2=CH\overset{+~~~~~}{CH}_2 \)
Subtopic:  Electron Displacement Effects |
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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.

Subtopic:  Electron Displacement Effects |
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The incorrect statement, among the following, is:
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.
Subtopic:  Electron Displacement Effects |
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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

Subtopic:  Electron Displacement Effects |
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