The correct order with respect to –I effect of the substituents is:
(R = alkyl)

1. -NH2 > - OR < - F
2. -NR2 < -OR < - F
3. -NH2 > - OR > - F
4. -NR2 > - OR > - F

Subtopic:  Electron Displacement Effects |
From NCERT
NEET - 2018
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The most stable carbocation among the following is:

1. 2.
3. 4.
Subtopic:  Electron Displacement Effects |
 51%
From NCERT
NEET - 2018
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Which among the given molecules can exhibit tautomerism? 

1.  III only

2.  Both I and III

3.  Both I and II

4.  Both II and III

Subtopic:  Structural Isomers |
 80%
NEET - 2016
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In pyrrole 
 
the electron density is maximum on:

1.  2 and 3

2.  3 and 4

3.  2 and 4

4.  2 and 5

Subtopic:  Electron Displacement Effects |
 78%
NEET - 2016
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The correct statement regarding electrophile is :

1. Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile
2. Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile
3. Electrophiles can be either neutral or positively charged species and can form a bond accepting a pair of electrons from a nucleophile
4. Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile

Subtopic:  Nucleophile & Electrophile |
 83%
From NCERT
NEET - 2017
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The IUPAC name of the compound     is:

1. 5-formylhex-2-en-3-one
2. 5-methyl-4-2-en-5-el
3. 3-keto-2-methylhex-5-enal
4. 3-keto-2-methylhex-4-enal

Subtopic:  Nomenclature |
 76%
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The most suitable method used for the separation of 1:1 mixture of ortho and para-nitrophenols is:

1. Chromatography 2. Crystallization
3. Steam distillation 4. Sublimation
Subtopic:  Qualitative Analysis of Organic Compounds |
 79%
From NCERT
NEET - 2017
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The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is:

1. The eclipsed conformation of ethane is more stable than staggered conformation because eclipsed conformation has no torsional strain
2. The eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has a torsional strain
3. The staggered conformation of ethane is more stable than the eclipsed conformation because staggered conformation has no torsional strain
4. The staggered conformation of ethane is less stable than eclipsed conformation because staggered conformation has torsional strain
Subtopic:  Conformational Isomers |
 82%
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NEET - 2016
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The correct order of strengths of the carboxylic acids :-



(a) I>II>III
(b) II>III>I
(c) III>II>I
(d) lI>I>IlI

Subtopic:  Acidic & Basic Character |
 55%
NEET - 2016
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Which among the given molecules can exhibit tautomerisrn?


1. III Only
2. Both I and III
3. Both Iand II
4. Both II and III

Subtopic:  Structural Isomers |
 62%
NEET - 2016
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