Reaction of x g of Sn with HCl quantitatively produced a salt....

Mass of salt produced $= 1 . 29g$

Moles of salt produced $= \dfrac{1 .29}{129} = 0 .01 mole$

To produce, $0 . 01mole$ organic salt $0 . 01mole$

${PhNO}_{2}$ and $0 . 03\text{mole}{SnCl}_{2}$ is required.

$0 . 03mole{SnCl}_{2}$ is produced from $0 . 03mole$ $Sn .$

Mass of $Sn = xgm = 0 .03 \times 119 = 3 .57 g$

Mass of ${PhNO}_{2} = ygm = 0 .01 \times 123 = 1 .23 g$

$x = 3 .57 y = 1 . 23$