Heterolysis of propane gives:

(1) Methyl and ethyl free radicals

(2) Methylium cation and Ethyl anion

(3) Methyl anion and Ethylium cation

(4) Methylium and Ethylium cations

Subtopic:  Reaction Intermediates |
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Amongst the following which of the above are true for SN2 reaction?

(i) The rate of reaction is independent of the concentration of the nucleophile

(ii) The nucleophile attacks the carbon atom on the side of the molecule opposite to the group being displaced.

(iii) The reaction proceeds with simultaneous bond formation and bond rupture.

1. (i), (ii)

2. (i), (iii)

3. (i), (ii), (iii)

4. (ii), (iii)

Subtopic:  SN1 & SN2 Reactions |
 62%
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Carbanions initiate:

(1) addition reactions

(2) substitution reaction

(3) both (1) and (2)

(4) none of these

Subtopic:  SN1 & SN2 Reactions |
 63%
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Dehydrogenation of ethanol to give ethanal is:(1) additional reaction  
(2) αα elimination reaction   
(3) αβ elimination reaction   
(4) αγ elimination reaction

Subtopic:  Hofmann's Elimination & Saytzeff Elimination |
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Ease of abstraction of hydrogen is greater when attached to:

(1) 1° carbon

(2) 2° carbon

(3) 3°carbon

(4) neo carbon

Subtopic:  Addition Reaction of C=C |
 65%
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Which step is the chain termination step in the following mechanism?

(i) Cl2hνCl+Cl
(ii) Cl+ CH4CH3+ HCl
(iii)CH3+Cl2CH3Cl+Cl
(iv)Cl+CH3CH3Cl

1. (i)

2. (ii)

3. (iii)

4. (iv)

Subtopic:  Reaction Intermediates |
 70%
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Which step is chain propagation step in the following mechanism?

(i) Cl2hνCl+Cl
(ii) Cl+ CH4CH3+ HCl
(iii)Cl+ClCl2
(iv)CH3+ HClCH3Cl

1. (i)

2. (ii)

3. (iii)

4.  (iv)

Subtopic:  Addition Reaction of C=N, C=0 |
 68%
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Carbanion can undergo:

1. rearrangement

2. combination with cation

3. addition to a carbonyl group

4. all of the above are correct

Subtopic:  Addition Reaction of C=C |
 70%
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The SN1 mechanism for substitution reaction by nucleophile is favored by:

1. Low concentration of nucleophile

2. Weak nature of the nucleophile

3. Polar solvent

4. All of the above

Subtopic:  SN1 & SN2 Reactions |
 76%
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SN1 mechanism for the reaction,

R-X+KOHROH+KX follow:

(1) carbocation mechanism

(2) carbanion mechanism

(3) free radical mechanism

(4) either of these

Subtopic:  SN1 & SN2 Reactions |
 75%
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