Question

Which from the following compounds is not obtained when methyl bromide is treated with ethyl bromide in presence of sodium metal in dry ether?

• A. n-Butane
• B. Ethane
• C. Propane
• D. 2-methyl propane

Hint:

Cross Wurtz coupling gives three alkanes: propane, ethane, n-butane.

Answer 1

The Correct Option is D

Step 1: Enumerate:
There are two radicals, methyl and ethyl, so three combinations: Me-Me, Me-Et, Et-Et.

Step 2: Names:
Those give ethane, propane and butane respectively. A branched four-carbon alkane would need a carbon with three carbon neighbours, which none of these combinations gives.

Step 3: Answer:
Option (D).

Final Answer:
Option (D). \[ \boxed{\text{(D) 2-methylpropane}} \]