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Assignment for Class 12 Chemistry Unit 14 Biomolecules
Class 12 Chemistry students should refer to the following printable assignment in Pdf for Unit 14 Biomolecules in Class 12. This test paper with questions and answers for Class 12 Chemistry will be very useful for exams and help you to score good marks
Unit 14 Biomolecules Class 12 Chemistry Assignment
Bio molecule
Gist Of The Chapter
1.Carbohydrates- These are optically active polyhydroxy aldehydes or ketones due to presence of chiral `C’ or the compounds which produce these on hydrolysis except dihydroxy acetone is not optically active.
2. Classification-
(i) Monosaccharide’s – Those carbohydrates which cannot get hydrolysed e.g. glucose ,fructose, galactose etc.
(ii) Oligosaccharides- Those carbohydrates which give to or more monosaccharide’s on hydrolysis e.g. sucrose on hydrolysis gives glucose and fructose. Raffinose on hydrolysis gives glucose, fructose and galactose.
(iii) Polysaccharides- Those carbohydrates which on hydrolysis give large number of monosaccharide’s hydrolysis.eg starch, cellulose, glycogen.
3. Sugar-
(i) Reducing Sugars- Those which reduce Fehling’s or Tollen’s reagent. They have free aldehydic groups, eg , glucose, fructose , galactose
(ii) Non Reducing Sugars- Those which do not reduce Fehling’s or Tollen’s reagent. They do not have free functional group ,e.g., sucrose
4. Glucose- It is a monosaccharide’s with molecular formula C6H12O6
5. Preparation
(i) From Sucrose
C12H22O11 + H2O -------> C6H12O6 + C6H12O6 ( Only from sucrose)
(ii)From Starch
(C6H10O5)n + nH2O -------> C12H22011 + H20 ------> 2C6H12O6
6.Structure
(i)Fischer structure –
CHO — [CHOH] — CH2OH
[+] Glucose has `D’ configuration as shown
`D’ means —OHgroup on first chiral `C’ from the bottom is on right hand and + means it is dextro rotator, i.e, it rotates plane polarized light towards right.
(ii) Cyclic Structure OF Glucose: the straight chain is unable to explain the following reactions.
(a) It does not give the 2, 4‐DNP test, Schiff’s Test and does not form the hydrogensulphide product with NaHSO3 .
(b) The pentacetate of glucose does not react with NH2OH, indicating the absence of free aldehydic group.
(iii) Glucose exist in 2 different crystalline forms α and β forms. These are called anomers. They differ in optical rotation, they also differ in melting point.
Anomers are isomers which have a different configuration across C‐1 (first chiral ‘C’ atom).
7. Glycosidic Linkage:The linkage between two monosaccharide units through oxygen is called the glycosidic linkage.
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CBSE Class 12 Chemistry Unit 14 Biomolecules Assignment
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a. Score higher marks: Regular practice of Chemistry Class 12 Assignments for chapter Unit 14 Biomolecules will help to improve understanding and help in solving exam questions correctly.
b. As per CBSE pattern: All questions given above follow the latest Class 12 Chemistry Sample Papers so that students can prepare as per latest exam pattern.
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a. Start with Class 12 NCERT and syllabus topics: Always read the chapter carefully before attempting Assignment questions for Class 12 Chemistry Unit 14 Biomolecules.
b. Solve without checking answers: You should first attempt the assignment questions on Unit 14 Biomolecules yourself and then compare with provided solutions.
c. Use Class 12 worksheets and revision notes: Refer to NCERT Class 12 Chemistry worksheets, sample papers, and mock tests for extra practice.
d. Revise tricky topics: Focus on difficult concepts by solving Class 12 Chemistry MCQ Test.
e. Maintain notebook: Note down mistakes in Unit 14 Biomolecules assignment and read them in Revision notes for Class 12 Chemistry
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Latest syllabus issued for current academic year by CBSE has been used to design assignments for Unit 14 Biomolecules Class 12
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