Question

Ethyl iodide is treated first with lithium in dry ether and then with cuprous iodide `(Cul)` and finally with `n`-Proply iodide. The expected alkane is
A. ethane
B. pentane
C. propane
D. butane

Answer 1

Correct Answer - B
It is the Corey-House synthesis.
`CH_(3)CH_(2)Iunderset(Et_(2)O)overset(Li)rarrCH_(3)Lioverset(Cu l)rarr(CH_(3)CH_(2))_(2)CuLioverset(CH_(3)CH_(2)CH_(2)I)rarrCH_(3)underset(Pent a n e)((CH_(2))_(3)CH_(3)`