1-Bromobutane is treated with KCN to give X; X is heated under reflux with dilute H2SO4 to give Y; Y is reduced with LiAlH4 followed by aqueous work-up to give Z. Z is

JEE Advanced levelSingle correct optionDifficulty 3 of 3ro050

1-Bromobutane is treated with KCN to give X; X is heated under reflux with dilute $H X_{2} SO X_{4}$ to give Y; Y is reduced with $LiAlH X_{4}$ followed by aqueous work-up to give Z. Z is

X is pentanenitrile (one carbon added), Y is pentanoic acid (acid hydrolysis of the nitrile), and Z is

CH X_{3} (CH X_{2}) X_{3} CH X_{2} OH

since

LiAlH X_{4}

reduces a carboxylic acid to a primary alcohol.