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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Palani ganesh
Look first that everything has Benzoic acid structure as a common one.Then lets come on to first three options.These all are cations and it will accept electrons thus becomes acidic than option(4) .And as per D>N>P rule (1) will be less than (2) and (3) .And the E.N of Phosphorus will be greater than Arsenic.:- Decrease in pkb value shows increase in basic strength thus shows decrease in acidic character
thnks for help ...