CBSE 12th Standard Chemistry Subject Biomolecules Ncert Exemplar 2 Mark Questions 2021
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CBSE 12th Standard Chemistry Subject Biomolecules Ncert Exemplar 2 Mark Questions 2021
12th Standard CBSE
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Reg.No. :
Chemistry
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Name the sugar present in milk. How many monosaccharide units are present in it ? What are the such oligosaccharides called ?
(a) -
How do you explain the presence of all the six carbon atoms in glucose in a straight chain ?
(a) -
Name the linkage connecting monosaccharide units in polysachharides.
(a) -
Under what conditions glucose is converted to gluconic and saccharic acid ?
(a)
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CBSE 12th Standard Chemistry Subject Biomolecules Ncert Exemplar 2 Mark Questions 2021 Answer Keys
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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.
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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. -
In a polysaccharide molecule, the monosaccharide units are linked through glycosidic linkage.
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On oxidation with mild oxidising agents such as \({ Br }_{ 2 }/{ H }_{ 2 }O\)glucose is converted into gluconic acid and on oxidation with strong oxidising agents such as conc.\({ HNO }_{ 3 }\), glucose is oxidised to saccharic acid.
