How many hydrogen atoms are there in a molecule of acetylene?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 2.
A molecule of acetylene (chemical formula C₂H₂) contains two hydrogen atoms. Acetylene is the simplest alkyne and consists of two carbon atoms connected by a triple bond, with each carbon also bonded to one hydrogen atom. This linear molecule is highly reactive due to its triple bond, making it useful in welding and as a chemical building block. The presence of just two hydrogen atoms reflects its unsaturated nature, distinguishing it from alkanes and alkenes in hydrocarbon chemistry.