Hydrocarbons: JEE Main 2026 Chemistry question

Styrene (X) is treated in sequence with (i) $\mathrm{Br_2/CHCl_3}$, (ii) $\mathrm{NaNH_2}$ excess, (iii) $\mathrm{CH_3I}$, (iv) $\mathrm{H_2}$, Na/$\mathrm{NH_3}$ ($l$) to give the major product (Y). Compound (X) is subjected to the sequence of reactions as shown above. Molar mass of the major product (Y) formed is ______ g mol$^{-1}$. (Given molar mass in g mol$^{-1}$ C:12, H: 1, O: 16)