Question

IUPAC name of ethylene is

• A. Ethane
• B. Ethyne
• C. Ethene
• D. None of these

Hint:

Memorize the suffixes for hydrocarbons: "-ane" for single bonds (alkanes), "-ene" for double bonds (alkenes), and "-yne" for triple bonds (alkynes).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
IUPAC (International Union of Pure and Applied Chemistry) nomenclature provides a systematic way of naming organic compounds. Ethylene is a common name. The question asks for its systematic IUPAC name.

Step 2: Detailed Explanation:
The molecular formula for ethylene is \(C_2H_4\), and its structure is \(CH_2=CH_2\).
To determine the IUPAC name, we follow these steps:
\begin{enumerate} \item Identify the parent chain: The longest carbon chain has 2 carbon atoms. The root word for 2 carbons is "eth".
\item Identify the principal functional group/bond type: The molecule contains a carbon-carbon double bond (C=C). The suffix for a double bond is "ene".
\end{enumerate} Combining the root word and the suffix gives the name Ethene.
For comparison:
\[\begin{array}{rl} \bullet & \text{Ethane (\(C_2H_6\)) is the alkane with two carbons (all single bonds).} \\ \bullet & \text{Ethyne (\(C_2H_2\)) is the alkyne with two carbons (a triple bond).} \\ \end{array}\]

Step 3: Final Answer:
The IUPAC name for ethylene is Ethene.