Paper chromatography is an example of:

1. Partition chromatography

2. Thin layer chromatography

3. Column chromatography

4. Adsorption chromatography

Subtopic:  Purification of Organic Compounds |
 51%
From NCERT
NEET - 2020
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A tertiary butyl carbocation is more stable than a secondary butyl carbocation because-

1. + R effect of CH3 groups 

2. -R effect of - CH3  groups 

3. Hyperconjugation 

4. -l effect of -CH3 groups 

Subtopic:  Electron Displacement Effects | Reaction Intermediates ; Preparation & Properties |
 73%
From NCERT
NEET - 2020
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A liquid compound (x) can be purified by steam distillation only if it is:

1. Steam volatile, immiscible with water 

2. Not steam volatile, miscible with water

3. Steam volatile, miscible with water

4. Not steam volatile, immiscible with water

Subtopic:  Purification of Organic Compounds |
 68%
From NCERT
NEET - 2020
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The most stable carbocation among the following is:

1.  2.
3. 4.
Subtopic:  Reaction Intermediates ; Preparation & Properties |
 67%
From NCERT
NEET - 2019
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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 |
 67%
From NCERT
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 |
 54%
From NCERT
AIPMT - 2010
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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 |
 82%
From NCERT
AIPMT - 2011
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Polarisation of electrons in acrolein may be written as:

1.  C+δH2=CH-C-δHO

2.  C-δH2=CH-C+δHO

3.  C-δH2=CH-CH+δO

4.  C+δH2=CH-CHO-δ

Subtopic:  Electron Displacement Effects |
 59%
From NCERT
AIPMT - 2000
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The correct order of –I effect is:

1. -NR3+ > -OR  > -F

2. -F > -NR3+ > -OR  

3.-NR3+ > -F  > -OR  

4. -OR  > -NR3+ > -F

Subtopic:  Electron Displacement Effects |
 66%
From NCERT
AIPMT - 1998
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The correct order of stability is:

1. 1–butene > Trans–2–butene > Cis–2–butene
2. Trans–2–butene > 1–butene > Cis–2–butene
3. Trans–2–butene > Cis–2-butene > 1–butene
4. Cis-2–butene > Trans–2–butene > 1–butene

Subtopic:  Electron Displacement Effects |
 65%
AIPMT - 2000
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