Question

A chelating agent has two or more than two donor atoms to bind to a single metal ion. Which of the following is not a chelating agent?

Options

• Thiosulphate

• Oxalato

• Glycinato

• Ethane-1, 2-diamine

Answer 1

Thiosulphate

Explanation:

Geometry of thiosulphato is not favourable to chelate a metal ion. The lengand 'thiosulphato' is \[\ce{S2O3^-}\], has only  one donor site, hence its geometry is not favourable to chelate a metal ion (i.e. for chetation)