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 total number of pi-bond electrons in the following structure are:
1. 4 2. 8
3. 12 4. 16
Subtopic:  Hybridisation & Structure of Carbon Compounds |
 66%
From NCERT
NEET - 2015
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In Kjeldahl’s method for estimation of nitrogen present in the soil sample, ammonia evolved from 0.75g of sample neutralized 10ml. of 1M H2SO4. The percentage of nitrogen in the soil is:

1. 37.33 2. 45.85
3. 25.75 4. 43.13
Subtopic:  Qualitative Analysis of Organic Compounds |
 71%
From NCERT
AIPMT - 2014
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The structure of the compound whose IUPAC name is 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is:

1. 2.
3. 4.

Subtopic:  Nomenclature |
 86%
From NCERT
AIPMT - 2013
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The correct order of increasing bond length of  C-H, C-O, C-C and C=C is:

1.  C-C<C=C<C-O<C-H

2.  C-O<C-H<C-C<C=C

3.  C-H<C-O<C-C<C=C

4.  C-H<C=C<C-O<C-C

Subtopic:  Hybridisation & Structure of Carbon Compounds |
 65%
From NCERT
AIPMT - 2011
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The Lassaigne’s extract is boiled with conc. HNO3 while testing for halogens, because it:

1. Helps in the precipitation of AgCl
2. Increases the solubility product of AgCl
3. Increases the concentration of NO3- ions
4. Decomposes Na2S and NaCN, if formed

Subtopic:  Qualitative Analysis of Organic Compounds | Quantitative Analysis of Organic Compounds |
 71%
From NCERT
AIPMT - 2011
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The most stable conformation of n-butane among the following is:

1. 2.
3. 4.
Subtopic:  Conformational Isomers |
 88%
From NCERT
AIPMT - 2010
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The correct order of acidity among the following is:

1.  CH3COOH > BrCH2COOH > ClCH2COOH > FCH2COOH
2. FCH2COOH > CH3COOH > BrCH2COOH > ClCH2COOH
3.  BrCH2COOH > ClCH2COOH > FCH2COOH > CH3COOH
4. FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH

Subtopic:  Electron Displacement Effects | Acidic & Basic Character |
 85%
From NCERT
AIPMT - 2007
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The correct order regarding the electronegativity of hybrid orbitals of carbon is:

1. sp>sp2<sp3

2. sp>sp2>sp3

3. sp<sp2>sp3

4. sp<sp2<sp3

Subtopic:  Hybridisation & Structure of Carbon Compounds |
 76%
From NCERT
AIPMT - 2006
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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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