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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The IUPAC name of the above mentioned compound is-

1. 3-Ket-2-methylhex-4-enal

2. 5-Formylhex-2-en-3-one

3. 5-Methyl-4-oxohex-2-en-5-al

4. 3-Keto-2-methylhex-4-enal

Subtopic:  Nomenclature |
 59%
From NCERT
NEET - 2017
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With respect to the conformers of ethane, which of the following statements is true?

(1) Bond angle remains same but bond length changes

(2) Bond angle changes but bond length remains same

(3) Both bond angle and bond length change

(4) Both bond angles and bond length remain same

Subtopic:  Conformational Isomers |
NEET - 2017
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The correct order of acidity among the following is:

1. CH2=CH2 >CH≡CH > CH3C≡CH > CH3-CH3

2. CH≡CH > CH3-C≡CH > CH2=CH2 >CH3-CH3

3. CH≡CH > CH2=CH2 > CH3-C≡CH > CH3-CH3

4. CH3-CH3 > CH2=CH2 > CH3-C≡CH > CH≡CH

Subtopic:  Acidic & Basic Character |
 70%
From NCERT
NEET - 2017
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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 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 |
 75%
From NCERT
NEET - 2017
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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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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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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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