\(X\) तथा \(Y\) के मध्य एक अभिक्रिया \(X\) के सापेक्ष प्रथम कोटि की है और \(Y\) के प्रति शून्य कोटि की है: 

प्रयोग	\(\frac{[ X ]}{ mol \;L ^{-1}}\)	\(\frac{[ Y ]}{ mol\; L ^{-1}}\)	प्रारंभिक वेग/\(mol\; L ^{-1}\; min ^{-1}\)
\(I\)	\(0.1\)	\(0.1\)	\(2 \times 10^{-3}\)
\(II\)	\(0.2\)	\(0.2\)	\(4 \times 10^{-3}\)
\(III\)	\(0.4\)	\(0.4\)	\(M \times 10^{-3}\)
\(IV\)	\(0.1\)	\(0.2\)	\(2 \times 10^{-3}\)

उपरोक्त आँकड़ो के विश्लेषण के आधार पर \(M\)  के संख्यात्मक मानों का अनुपात है | (निकटतम पूर्णांक में)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.