Geometrical isomerism can be shown by:

1.
2.
3.
4.

Subtopic:  Stereo Isomers |
 90%
Level 1: 80%+
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Free radical formation will take place in :

1.
2.
3.
4.
Subtopic:  Reaction Intermediates ; Preparation & Properties |
 87%
Level 1: 80%+
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The effect that can explain the given order of acidity of the carboxylic acids is-

Cl3CCOOH > Cl2CHCOOH > ClCH2COOH

1. +I effect

2. -I effect

3. +E effect

4. -E effect

Subtopic:  Electron Displacement Effects |
 91%
Level 1: 80%+
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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%
Level 2: 60%+
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The 3° carbon atom in the given structure is :
\(\mathrm{H}_3 \mathrm{C}-\mathrm{CH}_2-\mathrm{CH}\left(\mathrm{CH}_3\right)-\mathrm{CH}_2-\mathrm{CH}_3\\ ~~a~~~~~~~~~~~b~~~~~~~~~~~~~c~~~~~~~~~~~~~~~~~~~d~~~~~~~~~~~e\)

1. a

2. b

3. c

4. e 

Subtopic:  Nomenclature |
 93%
Level 1: 80%+
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In which of the following compounds, the carbon marked with an asterisk is most electronegative?

1. CH3-CH2-*CH2-CH3

2. CH3-*CH=CH-CH3

3. CH3-CH2-C*CH

4. CH3-CH2-CH=*CH2

Subtopic:  Hybridisation & Structure of Carbon Compounds |
 87%
Level 1: 80%+
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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 |
 68%
Level 2: 60%+
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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%
Level 3: 35%-60%
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Which carboxylate ion among the following is the most stable?

1. 2.
3. 4.

Subtopic:  Electron Displacement Effects |
 81%
Level 1: 80%+
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Match the terms mentioned in Column-I with the terms in Column-II.

Column-I (Term) Column-II (Definition)
A. Carbocation  (i) Species that can receive a pair of electrons.
B. Nucleophile  (ii) Conjunction of electrons of \(C-H ~\sigma-\) bond with the empty p-orbital present in adjacent positively charged carbon. 
C. Hyperconjugation (iii)  sp2 hybridised carbon with empty p-orbital. 
D. Electrophile  (iv) Species that can donate a pair of electrons.
 
Options:  A   B   C   D 
1. (iii) (iv) (ii) (i)
2. (i) (ii) (iii) (iv)
3. (i) (iv) (iii) (ii)
4. (iv) (i) (iii) (ii)
Subtopic:  Hybridisation & Structure of Carbon Compounds |
 82%
Level 1: 80%+
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