Question

Reaction of propyl bromide with lithium diisopropyl cuperate produces:

• A. 2-Methylpropane
• B. 2-Methylpentane
• C. Hexane
• D. 2,3-Dimethylbutane

Answer 1

The correct option is B 2-Methylpentane

Reaction of alkyl halides with dialkyl copper reagents to give alkanes, is called Corey House synthesis.
$C{H}_{3}C{H}_{2}C{H}_{2}Br+{\left(C{H}_3\stackrel{C{H}_3}{\stackrel{|}{C}H}\right)}_{2}CuLi\to C{H}_3\stackrel{C{H}_3}{\stackrel{|}{C}H}C{H}_{2}C{H}_{2}C{H}_3$
Hence 2-methylpentane is the main product.