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CBSE 12th Standard Chemistry Subject Biomolecules Ncert Exemplar 2 Mark Questions 2021

Published on: 25/05/2021

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Std: 12th Standard CBSE - Chemistry

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Questions:

Generic 2

3 x 2 = 6

Name the linkage connecting monosaccharide units in polysachharides.

How do you explain the presence of all the six carbon atoms in glucose in a straight chain ?

Name the sugar present in milk. How many monosaccharide units are present in it ? What are the such oligosaccharides called ?

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Answers Key:

Generic 2

3 x 2 = 6

In a polysaccharide molecule, the monosaccharide units are linked through glycosidic linkage.

Glucose on prolonged heating with HI gives n-hexane
\(HOC{ H }_{ 2 }CHOHCHOHCHOHCHOHCHO\overset { HI\quad (excess) }{ \underset { Prolonged\quad heating }{ \longrightarrow } } \underset { n-Hexane }{ { CH }_{ 3 }{ CH }_{ 2 }{ CH }_{ 2 }CH_{ 2 }{ CH }_{ 2 }{ CH }_{ 3 } } \)
Since n-hexane has six carbon atoms connected in a straight chain, therefore, glucose also has six carbon atoms connected in a straight chain.

Sugar present in milk (i.e., milk sugar) is called lactose. Two monosaccharide units (i.e., glucose and galactose) are present in it. Such oligosaccharides are called disaccharides.