Which of the following does not exhibit optical isomerism?

(1) Maleic acid      

(2) α-amino acids

(3) Lactic acid       

(4) Tartaric acid

Subtopic:  Stereo Isomers |
 56%
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Which one of the following is most reactive towards electrophilic reagent?

Subtopic:  Nucleophile & Electrophile |
From NCERT
NEET - 2011
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Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by:-

1. Oxidation
2. Cracking
3. Distillation under reduced pressure
4. Hydrolysis

Subtopic:  Alkanes, Alkenes and Alkynes - Chemical Properties |
 71%
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Which one of the following has the most acidic nature?

1. 

2. 

3. 

4. 

Subtopic:  Acidic & Basic Character |
 77%
From NCERT
NEET - 2010
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The stability of carbanions in the following

is in the order of

(a) (1)>(2)>(3)>(4)

(b) (2)>(3)>(4)>(1)

(c) (4)>(2)>(3)>(1)

(d) (1)>(3)>(2)>(4)

 

Subtopic:  Reaction Intermediates ; Preparation & Properties |
 55%
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The IUPAC name of is

(a) 3, 4-dimethylpentanoyl chloride

(b) 1-chloro-1-oxo-2, 3-dimethylpentane

(c) 2-ethyl-3-methylbutanoyl chloride

(d) 2, 3-dimethylpentanoyl chloride

Subtopic:  Nomenclature |
 80%
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The Lassaigne's extract is boiled with conc. HNO3  while testing for the halogens. By doing so it :-

(1) decomposes Na2S and NaCN, if formed

(2) helps in the precipitation of AgCl

(3) increases the solubility product of AgCl

(4) increases the concentration of NO3- ions

Subtopic:  Qualitative Analysis of Organic Compounds |
 70%
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Ether and benzene can be separated by-
1. Filtration
2. Distillation
3. Crystallization
4. Sublimation

Subtopic:  Quantitative Analysis of Organic Compounds |
 69%
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The molecule among the following having the highest reactivity toward the SN1 reaction is:

1. C6H5CH(C6H5)Br

2. C6H5CH(CH3)Br

3. C6H5C(CH3)(C6H5)Br

4. C6H5CH2Br

Subtopic:  Nucleophile & Electrophile |
 79%
From NCERT
NEET - 2010
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The radical  is aromatic because it has:

1. 6 p-orbitals and 6 unpaired electrons

2. 7 p-orbitals and 6 unpaired electrons

3. 7 p-orbitals and 7 unpaired electrons

4. 6 p-orbitals and 7 unpaired electrons

Subtopic:  Reaction Intermediates ; Preparation & Properties |
From NCERT
NEET - 2013
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