$$\text{RMgI}$$ when treated with ice cold water liberated a gas which occupied $$1.4\,\text{dm}^3/\text{g}$$ at STP. The gas produced is further reacted with iodine in presence of $$\text{HIO}_3$$ to give compound (X). Compound (X) in presence of Na and dry ether produced compound (Y). Molar mass of compound (Y) is $$\underline{\hspace{2cm}}$$ $$\text{g mol}^{-1}$$. (Nearest integer)