Ethylmagnesium bromide is treated with ethanenitrile, CH3CN, and then with H3O+ to give X. X is warmed with I2 and aqueous NaOH to give a yellow precipitate and a sodium salt Y. Y is

JEE Advanced levelSingle correct optionDifficulty 3 of 3hx088

Ethylmagnesium bromide is treated with ethanenitrile, $CH X_{3} CN$ , and then with $H X_{3} O X^{+}$ to give $X$ . $X$ is warmed with $I X_{2}$ and aqueous $NaOH$ to give a yellow precipitate and a sodium salt $Y$ . $Y$ is

Addition of the ethyl carbanion to

C \equiv N

gives an imine salt which hydrolyses to the ketone

CH X_{3} COCH X_{2} CH X_{3}

, butan-2-one. It has a

CH X_{3} CO X^{-}

group, so the iodoform reaction gives

CHI X_{3}

and the carboxylate of the remaining chain,

CH X_{3} CH X_{2} COONa

Y

is sodium propanoate.