The principle involved in paper chromatography is

1. Adsorption

2. Partition

3. Solubility 

4. Volatility

Subtopic:  Purification of Organic Compounds |
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The correct order of decreasing stability of the following cations is -

CH3-CH-CH3      ICH3-CH-OCH3IICH3-CH-CH2-OCH3III

1. II>I>III

2. I>II>III

3. II<I<III

4. I<II<III

Subtopic:  Electron Displacement Effects |
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 The correct IUPAC name for  is _____.

1. 2-Ethyl-3-methylpentane

2. 3,4-Dimethylhexane

3. 2-sec-Butylbutane

4. 2,3-Dimethylbutane

Subtopic:  Nomenclature |
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Which of the following carbon marked with asterisk is expected to have greatest positive charge?

1. *CH3-CH2-Cl

2. *CH3-CH2-Mg+Cl-

3. *CH3-CH2-Br

4. *CH3-CH2-CH3

Subtopic:  Electron Displacement Effects |
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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 |
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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 |
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Covalent bonds can undergo fission in two different ways. The correct representation involving heterolytic fission of CH3-Br is

1. 

2. 

3.  

4.

Subtopic:  Bond Cleavage & Isomerism |
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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 |
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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

          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 |
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