Which one of the following statements is true for $\underline {X}$
(I) It gives propionic acid on hydrolysis
(II) It has an ester function
(III) It has a nitrogen linked to ethyl carbon
(IV) It has a cyanide group
\[\begin {array} {1 1} (1)\;IV & \quad (2)\;III \\ (3)\;II & \quad (4)\;I \end {array}\]
