Question

An unsaturated hydrocarbon in the following is —

• A. C2H2
• B. CH4
• C. C2H6
• D. C3H8

Hint:

Unsaturated hydrocarbons contain double or triple bonds — alkenes have C=C, and alkynes have C≡C bonds.

Answer 1

The Correct Option is A

Step 1: Understanding unsaturated hydrocarbons.
Hydrocarbons that contain double or triple bonds between carbon atoms are called unsaturated hydrocarbons. They do not contain the maximum number of hydrogen atoms possible.
Step 2: Analyzing each compound.
- (A) C2H2 → Ethyne (acetylene) contains a triple bond, hence unsaturated.
- (B) CH4 → Methane, contains only single bonds, so saturated.
- (C) C2H6 → Ethane, all single bonds, saturated.
- (D) C3H8 → Propane, all single bonds, saturated.
Step 3: Conclusion.
Hence, C{2H2} is the correct answer as it is an unsaturated hydrocarbon (alkyne).