The major product of the following reaction is :

The element that shows greater ability to form p$$\pi $$-p$$\pi $$ multiple bonds, is :

The correct structure of histidine in a strongly acidic solution (pH = 2) is -

If K_sp of Ag₂CO₃ is 8 $$ \times $$ 10^–12, the molar solubility of Ag₂CO₃ in 0.1 M AgNO₃ is -