Cyanohydrins can be made by reacting ketones with an acidified solution of sodium cyanide.
${(C H_{3})}_{2} C = O + H^{+} + C N^{-} \to {(C H_{3})}_{2} C (O H) C N$
In a series of experiments, the reaction was carried out with different concentrations of the three reagents, and the following relative initial rates were obtained.
Experiment
number $[{(C H_{3})}_{2} C O] (m o l d m^{- 3})$ $[H^{+}] (m o l d m^{- 3})$ $[C N^{-}] (m o l d m^{- 3})$
Relative initial rate
$(m o l d m^{- 3} \sec^{- 1})$
1 0.020 0.060 0.060 1.00
2 0.020 0.050 0.050 0.833
3 0.020 0.050 0.060 1.00
4 0.025 0.050 0.050 1.042
Order of the reaction when excess cyanide ion is taken is X and order of the reaction when excess of propanone taken is Y. What is the value of (X+Y)?

Question

Cyanohydrins can be made by reacting ketones with an acidified solution of sodium cyanide.
${(C H_{3})}_{2} C = O + H^{+} + C N^{-} \to {(C H_{3})}_{2} C (O H) C N$
In a series of experiments, the reaction was carried out with different concentrations of the three reagents, and the following relative initial rates were obtained.

Experiment number	$[{(C H_{3})}_{2} C O] (m o l d m^{- 3})$	$[H^{+}] (m o l d m^{- 3})$	$[C N^{-}] (m o l d m^{- 3})$	Relative initial rate $(m o l d m^{- 3} \sec^{- 1})$
1	0.020	0.060	0.060	1.00
2	0.020	0.050	0.050	0.833
3	0.020	0.050	0.060	1.00
4	0.025	0.050	0.050	1.042

Order of the reaction when excess cyanide ion is taken is X and order of the reaction when excess of propanone taken is Y. What is the value of (X+Y)?