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 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 |
 73%
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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 |
 79%
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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 |
 57%
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The correct order of decreasing stability of the following carbocations is:

I \( \begin{aligned} &~~~~~~~~~~~~\oplus\\ & CH_3 - CH-CH_3 \end{aligned}\)
II \( \begin{aligned} &~~~~~~~~~~~~\oplus\\ & CH_3 - CH-OCH_3\end{aligned}\)
III \( \begin{aligned} & ~~~~~~~~~~~~\oplus\\ &CH_3 - CH-CH_2- OCH_3\end{aligned}\)
1. II>I>III 2. I>II>III
3. II<I<III 4. I<II<III
Subtopic:  Electron Displacement Effects |
 57%
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The principle involved in paper chromatography is

1. Adsorption

2. Partition

3. Solubility 

4. Volatility

Subtopic:  Purification of Organic Compounds |
 58%
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During the hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. The technique that can give the best results is-

1. Column chromatography 2. Solvent extraction
3. Distillation 4. Thin layer chromatography
Subtopic:  Purification of Organic Compounds |
 66%
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