Question

Which of the following alkanes is NOT obtained when a mixture of ethyl iodide and n-propyl iodide is subjected to Wurtz reaction?

• A. n-Butane
• B. Propane
• C. n-Pentane
• D. n-Hexane

Hint:

Wurtz couples two alkyl groups: C2+C2, C3+C3 and C2+C3 are the only products.

Answer 1

The Correct Option is B

Step 1: Count carbons:
Possible chain lengths equal the sum of the carbons of the two groups joined.

Step 2: List:
$2+2=4$ (butane), $3+3=6$ (hexane), $2+3=5$ (pentane).

Step 3: Missing:
A three-carbon product would need a 1-carbon fragment, which is not present. So propane is not obtained, option (B).

Final Answer:
Propane cannot be formed. \[ \boxed{\text{(B) }\text{Propane}} \]