40. Threonine is one of the naturally coded amino acids and its structure is shown as follows, How many chiral centers in threonine? (A)0 (B)1 (C)2 (D)3 (E)4

7. Consider the following octahedral complex structures, each involving ethylenediamine and two different monodentate ligands, X and Y. Which one of the following statements about these structures is incorrect? (A)Structures 1 and 2 are optical isomers. (B)Structures 1 and 3 are optical isomers. (C)Structures 1 and 3 are different complexes. (D)Structures 1 and 4 are geometrical isomers. (E)Structures 3 and 4 are the same complex.

40. Threonine is one of the naturally coded amino acids and its structure is shown as follows,
How many chiral centers in threonine?

(A)0

(B)1

(C)2

(D)3

(E)4

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