Detection of the following Functional Groups: Hydroxyl, Carbonyl Carboxyl, and Amino Groups in Organic Compounds NEET Questions

Organic Chemistry - Principles of Practical Chemistry

Detection of the following Functional Groups: Hydroxyl, Carbonyl Carboxyl, and Amino Groups in Organic Compounds MCQ Questions


1.
Which of the following reagents is used as a group reagent for the detection of alcoholic (–OH) group in an organic compound?
A.
Ceric ammonium nitrate solution
B.
Schiff's reagent
C.
Molisch's reagent
D.
Tollens' reagent
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ANSWER :
A. Ceric ammonium nitrate solution
2.
On adding ceric ammonium nitrate to an alcohol, the colour observed is:
A.
Blue
B.
Green
C.
Violet
D.
Red / wine red
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ANSWER :
D. Red / wine red
3.
The reaction of an alcohol with metallic sodium is used to test which functional group? The gas evolved is:
A.
Carboxylic –COOH; CO2 gas evolved
B.
Alcoholic –OH; H2 gas evolved with brisk effervescence
C.
Phenolic –OH; O2 gas evolved
D.
Carbonyl >C=O; H2 gas evolved
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ANSWER :
B. Alcoholic –OH; H2 gas evolved with brisk effervescence
4.
In the acetyl chloride test for alcohols, the formation of white fumes near a glass rod dipped in NH4OH indicates:
A.
Formation of acetic acid which gives white fumes
B.
Liberation of Cl2 gas
C.
Liberation of HCl which forms NH4Cl fumes with NH3
D.
Formation of NH4OAc precipitate
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ANSWER :
C. Liberation of HCl which forms NH4Cl fumes with NH3
5.
Lucas reagent is a mixture of:
A.
Anhydrous ZnCl2 and concentrated HCl
B.
ZnCl2 and dilute H2SO4
C.
FeCl3 and concentrated HCl
D.
Anhydrous AlCl3 and concentrated HCl
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ANSWER :
A. Anhydrous ZnCl2 and concentrated HCl
6.
With Lucas reagent, the order of speed of turbidity (cloudiness) appearance is:
A.
Primary > Secondary > Tertiary
B.
All react at the same rate
C.
Secondary > Tertiary > Primary
D.
Tertiary > Secondary > Primary
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ANSWER :
D. Tertiary > Secondary > Primary