How do expimers differ from anomers ?

Give reason for the following :
(i) On electrolysis in acidic solution, aminoacids migrate towards cathode while in alkaline solution these migrate towards anode.
(ii) The mononamino monocarboxylic acids have two pK values.

What forces are responsible for the stability of \(\alpha\) - helix ? Why is it named as 3.6₁₃ helix?

The K_a and K_b values of \(\alpha\) - amino acids are very low. Explain.

Write the structure of alanine at pH = 2 and pH = 10.

Which of the following will reduce Tollens ' reagent ? Explain.

Vitamins represents a group of organic compounds which are needed in small amounts for the healthy growth and maintenance of our body. These are not synthesised by the body and are supplied by the diet. The deficiency of vitamins can be supplemented with medicines.
(i) Which vitamins are water soluble ?
(ii) What are the chemical name of vitamin C and vitamin D ?
(iii) What is the source of vitmain K ?
(iv) How is vitamin K useful ?

After watching a programme on TV about the adverse effect of junk food and soft drinks on the health of school children, Sonali, a student of class XII, discussed the issue with the school principal. Principal immediately instructed the canteen contractor to replace the fast food with fibre and vitamin rich food like sprouts, salad, fruits etc. This decision was welcomed by the parents and the students.
After reading the above passage, answer the following questions:
(i) What values are expressed by Sonali and the principal of the school?
(ii) Give two examples of water soluble vitamins.

Shanti a domestic helper of Mrs. Anuradha, fainted while mopping the floor. Mrs. Anuradha immediately took her to the nearby hospital where she was diagnosed to be severely anaemic. The doctor prescribed an iron rich diet and multivitamins supplement to her. Mrs. Anuradha supported her 'financially to get the medicines. After a month, Shanti was diagnosed to be normal.
After reading the above passage, answer the following questions:
(i) What values are displayed by Mrs. Anuradha ?
(ii) Name the vitamins whose deficiency causes pernicious anaemia.
(iii) Give an example of water soluble vitamin.

Carbohydrates form a group of naturally occuring organic compounds and are a major source of energy for our body. Some common examples are of cane sugar, glucose etc. Chemically these are either polyhydric aldehydes or polyhydric ketones and are classified as monosaccharides, oligosaccharides and polysaccharides.
(i) Name the carbohydrates which has maximum sweetners.
(ii) Which carbohydrate is present in milk?
(iii) Why is sucrose a non-reducing sugar ?
(iv) How do carbohydrates (starch in particular) act as a source of energy for our body?