What are vitamins? Name any two diseases caused by deficiency of vitamins A. Write the structures of (a) nucleoside (b) nucleotide. How are I-nitropropane, 2-nitropropane and 2-methy-2 nitropropane are distinguised from each other using nitrous acids?

What are vitamins? Name any two diseases caused by deficiency of vitam

1.	What are vitamins? Name any two diseases caused by deficiency of vitamins A. Write the structures of (a) nucleoside (b) nucleotide. How are I-nitropropane, 2-nitropropane and 2-methy-2 nitropropane are distinguised from each other using nitrous acids?
Answer» Solution :Vitamins are the organic substance that must be SUPPLIED to permit proportionate growth in living being or for the maintenance of the STRUCTURE. Diseaes: 1. Night blindness 2. Retardation of growth 3. DRYNESS of hair and skin Primary nitroalkane reacts with NITROUS acid to form blue COLOURED nitroso-nitro propane which reacts with NaOH to give red colour solution. `CH_(3) - underset(H)underset(\|)overset(H)overset(\|)(C )- underset(H)underset(\|)overset(H)overset(\|)(C ) -overset(O)overset(\|\|)(N) - O + HO - N = O to When 2-nitropropane is treated withh nitrous acid it gives blue coloured nitro-nitroso propane which do not react with NaOH due to absence of alpha hydrogen. `CH_(3) - underset(H)underset(\|)overset(CH_(3))overset(\|)(C ) - overset(O)overset(\|)(N) - O + HO - N = O to` CH_(3) - underset(NO)underset(\|)overset(CH_(3))overset(\|)(C ) - overset(O)overset(\|\|)(N) - O + H_(2) O` 2-methyl 2-nitropropane does not react with nitrous acid due to absence of alpha hydrogen.