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# a)Give reasons for the following : (i) Glucose does not give 2,4-DNP test and Schiff’s test (ii) Amino acids have high melting points and are soluble in water. (b) What is meant by the secondary structure of proteins?

(i) In the cyclic structure of glucose - CHO group is not free as it forms as hemiacetal linkage with -OH group at $C-5$