cystine is made up of two cysteine residues joined by a disulfide bond. explain why the two carboxyl groups have different pka values, even though they both have the same ligands. along the same lines explain why the pka values of the two amino groups differ even more.

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Organometallic compounds of d-block elements

The transition metals can form complexes since they have vacant d orbitals. They are also termed Coordination compounds. The organometallic compounds of the transition metals could be used as catalysts as well as reagents. For example, organocadmium, organozinc, organocopper, Grignard are used as the reagents for several reactions. Most of the complexes of organo transition metals are used as catalysts for many organic transformation reactions.