The purification method based on the difference in solubilities of the compound and the impurities in a solvent is -
1. Crystallisation
2. Distillation
3. Chromatography
4. Isolation

Subtopic:  Purification of Organic Compounds |
 70%
From NCERT
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Functional isomer is not possible for:
1. Alcohols
2. Aldehydes
3. Alkyl halides
4. Cyanides

Subtopic:  Structural Isomers |
 79%
From NCERT
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The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapor in the vapor phase. A suitable method for the extraction of these oils from the flowers is

1. Distillation 2. Crystallisation
3. Distillation under pressure 4. Steam distillation
Subtopic:  Quantitative Analysis of Organic Compounds |
 67%
From NCERT
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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. Which technique is most effective in providing the best results?
1. Column chromatography
2. Solvent extraction
3. Distillation
4. Thin layer chromatography
Subtopic:  Purification of Organic Compounds |
 69%
From NCERT
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Paper chromatography operates based on which of the following principles?

1. Adsorption

2. Partition

3. Solubility 

4. Volatility

Subtopic:  Purification of Organic Compounds |
 61%
From NCERT
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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 |
 59%
From NCERT
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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 |
 58%
From NCERT
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Which carboxylate ion among the following is the most stable?

1. 2.
3. 4.

Subtopic:  Electron Displacement Effects |
 81%
From NCERT
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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:

\(\mathrm{H}_3 \mathrm{C}-\mathrm{HC}=\mathrm{CH}_2+\mathrm{H}^{+} \rightarrow \text { ? }\)

1. 2° carbanion

2. 1° carbocation

3. 2° carbocation

4. 1° carbanion

Subtopic:  Nucleophile & Electrophile |
 71%
From NCERT
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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 |
 84%
From NCERT
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