The most stable carboxylate ion among the following is-

1. CH3-C||O-O-

2. Cl-CH2-C||O-O-

3. F-CH2-C||O-O-

4. (F)2-CH-C||O-O-

Subtopic:  Electron Displacement Effects |
 79%
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Electrophilic addition reactions proceed in two steps. The first step involves the addition of an electrophile. The major intermediate formed in the first step is -

H3C-HC=CH2+H+?

1. 2° carbanion

2. 1° carbocation

3. 2° carbocation

4. 1° carbanion

Subtopic:  Nucleophile & Electrophile |
 69%
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The correct representation involving heterolytic fission of CH3-Br among the following is:

1.
2.
3.
4.
Subtopic:  Bond Cleavage & Isomerism |
 83%
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The addition of HCl to an alkene proceeds in two steps. The first step is the attack of H+ ion on the double bond portion. The same can be shown as-

1. 2.
3. 4. All of these are possible
Subtopic:  Nucleophile & Electrophile |
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Match the type of mixture of compounds in Column I with the technique of separation/purification given in column II.

Column I Column II
A. Two solids which have different solubilities in a solvent and which do not undergo a reaction when dissolved in it 1. Steam distillation
B. Liquid that decomposes at its boiling point 2. Fractional distillation
C. Steam volatile liquid 3. Crystallisation
D. Two liquids that have boiling points close to each other 4. Distillation under reduced pressure

Codes

A B C D
1. 3 4 1 2
2. 1 2 3 4
3. 1 4 3 2
4. 4 1 3 2
Subtopic:  Purification of Organic Compounds |
 84%
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Match the terms mentioned in Column I with the terms in Column II.

Column I

Column II

A. Carbocation 

1. Species that can receive a pair of electrons 

B. Nucleophile 

2. Conjunction of electrons of C - Hσ  bond with the empty p-orbital present in adjacent positively charged carbon  

C. Hyperconjugation 

3. sp2 hybridised carbon with empty p-orbital  

D. Electrophile 

4. Species that can donate a pair of electrons 


Codes

Options:  A   B   C   D 
1.  3 4 2 1
2. 1 2 3 4
3. 1 4 3 2
4. 4 1 3 2

Subtopic:  Hybridisation & Structure of Carbon Compounds |
 80%
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Match Column I with Column II.

Column I Column II
A. Dumas method 1. AgNO3
B. Kjeldahl’s method 2. Silica gel
C. Carius method 3. Nitrogen gel
D. Chromatography 4. Ammonium sulphate

Codes

A B C D
1. 3 4 1 2
2. 1 2 3 4
3. 1 4 3 2
4. 4 1 3 2
Subtopic:  Quantitative Analysis of Organic Compounds |
 74%
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Match the intermediates given in Column I with their probable structure in Column II.

Column I

Column II

A. Free radical

1. Trigonal planar

B. Carbocation

2. Pyramidal

C. Carbanion

3. Linear

Codes

Options:  A   B   C 
1. 1 1 2
2. 1 2 3
3. 3 1 2
4. 2 1 3

  

Subtopic:  Reaction Intermediates ; Preparation & Properties |
 55%
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Match the ions given in Column I with their nature-given in Column II.

Column I

Column II

A. 

1. Stable due to resonance

B. F3-C+

2. Destabilised due to inductive effect

C. 

3. Stabilised by hyperconjugation.

D. CH3-CH-CH3

4. A secondary carbocation

Codes

Options:  A   B   C   D 
1.  1,2  2 2  3,4 
2. 1 2,4   3  4
3.  1  4  3  2
4.  4  1  3  2

Subtopic:  Electron Displacement Effects | Reaction Intermediates ; Preparation & Properties |
 75%
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Given below are two statements: 

Assertion (A):  Simple distillation can help in separating a mixture of propan-1-ol (boiling point  97 ° C ) and propanone (boiling point  56 ° C ).
Reason (R): Liquids with a difference of more than  20 ° C  in their boiling points can be separated by simple distillation.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Qualitative Analysis of Organic Compounds |
 83%
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