Carbohydrates (Classification; Aldoses and Ketoses...) NEET Questions

Organic Chemistry - Biomolecules

Carbohydrates (Classification; Aldoses and Ketoses...) MCQ Questions


1.
Carbohydrates are chemically defined as:
A.
Polyhydroxy alcohols only
B.
Hydrates of carbon with general formula Cx(H2O)y only
C.
Optically active polyhydroxy aldehydes or ketones or compounds that produce such units on hydrolysis
D.
Optically inactive polyhydroxy aldehydes or ketones
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ANSWER :
C. Optically active polyhydroxy aldehydes or ketones or compounds that produce such units on hydrolysis
2.
Which of the following compounds fits into the general formula Cx(H2O)y but is NOT a carbohydrate?
A.
Acetic acid (CH3COOH)
B.
Fructose (C6H12O6)
C.
Ribose (C5H10O5)
D.
Glucose (C6H12O6)
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ANSWER :
A. Acetic acid (CH3COOH)
3.
Rhamnose (C6H12O5) is a carbohydrate but it does NOT fit into the general formula Cx(H2O)y. This indicates that:
A.
Not all carbohydrates fit into the general formula Cx(H2O)y
B.
Rhamnose contains nitrogen
C.
The molecular formula of rhamnose is wrong
D.
Rhamnose is incorrectly classified
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ANSWER :
A. Not all carbohydrates fit into the general formula Cx(H2O)y
4.
Carbohydrates that cannot be hydrolysed further to give simpler units are called:
A.
Disaccharides
B.
Monosaccharides
C.
Oligosaccharides
D.
Polysaccharides
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ANSWER :
B. Monosaccharides
5.
Approximately how many monosaccharides are known to occur in nature?
A.
About 10
B.
About 50
C.
About 20
D.
About 100
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ANSWER :
C. About 20
6.
Carbohydrates that yield 2 to 10 monosaccharide units on hydrolysis are called:
A.
Monosaccharides
B.
Aldoses
C.
Polysaccharides
D.
Oligosaccharides
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ANSWER :
D. Oligosaccharides