The name of C3H4 is
A. butene
B. propane
C. propyne
D. propene
The Correct Answer and Explanation is :
The correct answer is C. propyne.
Explanation:
C3H4 is a hydrocarbon with three carbon atoms and four hydrogen atoms. To understand the name of this compound, we first need to look at its structure and the rules for naming hydrocarbons.
- Basic Structure: Hydrocarbons can be categorized as alkanes, alkenes, and alkynes based on the type of bonds between carbon atoms:
- Alkanes have only single bonds (C–C).
- Alkenes contain at least one double bond (C=C).
- Alkynes contain at least one triple bond (C≡C).
- Molecular Formula Analysis: For a hydrocarbon with the general formula CnH2n+2, n represents the number of carbon atoms. In the case of C3H4:
- If we substitute n = 3, we get H2(3)+2 = H8, which means C3H4 cannot be an alkane.
- For alkenes (C3H6), substituting n = 3 gives H2(3) = H6, so C3H4 is not an alkene either.
- For alkynes, the formula is CnH2n-2. Substituting n = 3 gives H2(3)-2 = H4, which matches our formula C3H4. This indicates that C3H4 is indeed an alkyne.
- Naming: The prefix for three carbon atoms is “prop-,” and since it is an alkyne, we add the suffix “-yne.” Therefore, the systematic name for C3H4 is propyne.
In conclusion, C3H4 has a triple bond between two of its carbon atoms, fitting the classification of an alkyne. Thus, the correct answer is C. propyne.