The increasing order of atomic radii of the following group 13 elements is

The product formed in the reaction of SOCl₂ with white phosphorus is

Under ambient conditions, the total number of gases released as products in the final step of the reaction scheme shown below is

The reaction of Cl₂ gas with cold-dilute and hot-concentrated NaOH in water give sodium salts of two (different) oxoacids of chlorine, P and Q, respectively. The Cl₂ gas reacts with SO₂ gas, in presence of charcoal, to give a product R. R reacts with white phosphorus to give a compound S. On hydrolysis, S gives an oxoacid of phosphorus, T.