The correct order of radii is

Options

A. `SO_(2) rarr H_(2)SO_(3)`
B. `NH_(3)+H^(+)rarr NH_(4)^(+)`
C. `N_(2)O_(6) rarr 2HNO_(3)`
D. `A` and `C` have same valency factor

Answer

4

Explanation

`(1) SO_(2)rarr H_(2)SO_(3)" "((M)/(E)=2)`
`(2)NH_(3)+H^(+)rarr NH_(4)^(+)" "((M)/(E)=1)`
`(3) N_(2)O_(5)rarr 2HNO_(3)" "((M)/(E)=2)`