The IUPAC name of  CH3CH=CHC≡CH is:

1. Pent - 3 - en - 1 - yne

2. Pent - 2 - en - 4 - yne

3. Pent - 1 - yn - 3 - ene

4. Pent - 4 - yn - 2 – ene

Subtopic:  Nomenclature |
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AIPMT - 2010
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The species among the following that is not an electrophile is:

1. BH3

2. H3O

3. NO2

4. Cl

Subtopic:  Nucleophile & Electrophile |
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The IUPAC name of the above-mentioned compound is:

1. cis-2-Chloro-3-iodo-2-pentene
2. trans-2-Chloro-3-iodo-2-pentene
3. cis-3-Iodo-4-chloro-3-pentene
4. trans-3-Iodo-4-chloro-3-pentene

Subtopic:  Nomenclature |
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AIPMT - 2011
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Which of the following conformers for ethylene glycol is most stable?

Subtopic:  Conformational Isomers |
AIPMT - 2010
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Given:
              I               II
I and II are classified as:
1. Identical
2. A pair of conformers
3. A pair of geometrical isomers
4. A pair of optical isomers
Subtopic:  Conformational Isomers |
 63%
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NEET - 2013
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Arrange the following in increasing order of stability:
(a) \(\left(\mathrm{CH}_3\right)_2 \stackrel{\oplus}{\mathrm{C}}-\mathrm{CH}_2-\mathrm{CH}_3 \)
(b) \(\left(\mathrm{CH}_3\right)_3 \stackrel{\oplus}{\mathrm{C}} \)
(c) \(\left(\mathrm{CH}_3\right)_2 \stackrel{\oplus}{\mathrm{C}}\mathrm{H} \)
(d) \( \text {CH}_3 \stackrel{\oplus}{\mathrm{C}}\mathrm{H}_2\)
(e) \( \stackrel{\oplus}{\mathrm{C}}\mathrm{H}_3 \)
 
1. e < d < c < a < b 2. d < e < c < a < b
3. a < e < d < c < b 4. e < d < c < b < a
Subtopic:  Reaction Intermediates ; Preparation & Properties |
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The hybridisation of benzyl carbonium ion   is:
1. sp2 2. spd2
3. sp2d 4. sp3
Subtopic:  Hybridisation & Structure of Carbon Compounds |
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Which of the following chemical system is non-aromatic?
1. 2.
3. 4.
Subtopic:  Aromaticity & Polarity |
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Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae:

1. \(Fe_3[Fe(CN)_6]_2\)

2. \(Fe_4[Fe(CN)_6]_3\)

3. \(Fe_4[Fe(CN)_6]_2\)

4. \(Fe_3[Fe(CN)_6]_3\)
Subtopic:  Qualitative Analysis of Organic Compounds |
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\(CH_3-CH_3, \ CH_3-CH_2-CH_3, \ \)
\(\left(CH_3\right)_2 CH-CH_3, \) and \(CH_3-CH_2-CH\left(CH_3\right)_2 \)

The increasing order of stability of the free radicals formed from homolytic fission of the above three alkanes is:

1. \(\begin{aligned} & (CH_3)_2 \dot{C}-CH_2 CH_3<CH_3-\dot{C} H-CH_3 \\ & <CH_3-\dot{C} H_2<(CH_3)_3 \dot{C} & \\ \end{aligned}\)
2. \( \begin{aligned} &CH_3-\dot{C} H_2<CH_3-\dot{C} H-CH_3 \\ & <\left(CH_3\right)_2 \dot{C}-CH_2 CH_3<\left(CH_3\right)_3 \dot{C}\end{aligned}\)
3. \(\begin{aligned} & CH_3-\dot{C} H_2<CH_3-\dot{C} H-CH_3\\ &<\left(CH_3\right)_3 \dot{C}<\left(CH_3\right)_2 \dot{C}-CH_2 CH_3 \end{aligned}\)
4. \(\begin{aligned} & \left(CH_3\right)_3 \dot{C}<\left(CH_3\right)_2 \dot{C}-CH_2-CH_3 \\ &<CH_3-\dot{C} H-CH_3<CH_3-\dot{C} H_2 \end{aligned}\)
Subtopic:  Reaction Intermediates ; Preparation & Properties |
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