हाइड्रोकार्बन \((A)\) ब्रोमीन से प्रतिस्थापन द्वारा अभिक्रिया करके एक ऐल्किल ब्रोमाइड देता है जो कि वुर्ट्ज़ अभिक्रिया द्वारा गैसीय हाइड्रोकार्बन में परिवर्तित होता है जिसमें कि चार से कम कार्बन परमाणु हैं । \((A)\) है

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.