यौगिक (X) [स्टाइरीन] को ऊपर दर्शाई गई अभिक्रियाओं के अनुक्रम से गुजारा जाता है: (i) \(Br_2/CHCl_3\) (ii) \(NaNH_2\) आधिक्य (iii) \(CH_3I\) (iv) \(H_2\), \(Na/NH_3\) \((l)\), जिससे मुख्य उत्पाद (Y) प्राप्त होता है। निर्मित मुख्य उत्पाद (Y) का मोलर द्रव्यमान ______ g mol\(^{-1}\) है।
(दिया गया मोलर द्रव्यमान g mol\(^{-1}\) में C:\(12\), H: \(1\), O: \(16\))

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.