Free radical formation will take place in -

1. 

2. 

3. 

4. 

Subtopic:  Reaction Intermediates ; Preparation & Properties |
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The arrangement in decreasing order of stability of CH3,C2H5,(CH3)2CH and (CH3)3 C free radicals is-

1. CH3C2H5 > (CH3)2CH > (CH3)3 C  

2. (CH3)3 C > (CH3)2CH > C2H5CH3

3. C2H5CH3 > (CH3)2CH > (CH3)3 C

4. (CH3)3 C > (CH3)2CH >  CH>C2H5

Subtopic:  Reaction Intermediates ; Preparation & Properties |
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The most stable carbocation among the following is-

1.   

2.   

3. 

4.  

Subtopic:  Reaction Intermediates ; Preparation & Properties |
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The most stable carbocation among the following is-

1. 

2. 
3. 
4. 

Subtopic:  Reaction Intermediates ; Preparation & Properties |
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A tertiary butyl carbocation is more stable than a secondary butyl carbocation because-

1. + R effect of CH3 groups 

2. -R effect of - CH3  groups 

3. Hyperconjugation 

4. -l effect of -CH3 groups 

Subtopic:  Electron Displacement Effects | Reaction Intermediates ; Preparation & Properties |
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The correct statement among the following is -

1. Allyl carbocation (CH2=CH-CH2+) is more stable than propyl carbocation

2. Propyl carbocation is more stable than allyl carbocation

3. Both are equally stable

4. None of the above

Subtopic:  Reaction Intermediates ; Preparation & Properties |
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The species that contains only three pairs of electrons among the following is-

1. Carbocation

2. Carbanion

3. Free radical

4. None of the above

Subtopic:  Reaction Intermediates ; Preparation & Properties |
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A paramagnetic species among the following is-

1. A carbocation                     

2. A free radical

3. A carbanion ion                 

4. All of the above

Subtopic:  Reaction Intermediates ; Preparation & Properties |
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The decreasing order of the stability of the given ions is-

1. I>II>III          

2. II>III>I

3. III>I>II          

4. II>I>III

 

Subtopic:  Reaction Intermediates ; Preparation & Properties |
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The compound that gives the most stable carbonium ion after C- Cl bond ionisation among the following  is-

1. 

2. 

3. 

4. 

Subtopic:  Reaction Intermediates ; Preparation & Properties |
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