To determine the correct IUPAC names for the compounds H-CO\(_2\)CH\(_3\) and CH\(_\equiv\)CH, we need to analyze each compound step by step. ### Step 1: Analyzing H-CO\(_2\)CH\(_3\) 1. **Structure Identification**: - The formula H-CO\(_2\)CH\(_3\) can be broken down as follows: - H-CO\(_2\) indicates a carboxylic acid functional group (–COOH). - CH\(_3\) indicates a methyl group (–CH\(_3\)). - Therefore, the compound can be represented as: - H-C(=O)-O-CH\(_3\) (which is methyl methanoate). 2. **IUPAC Naming**: - The carboxylic acid part (H-CO\(_2\)) is derived from methanoic acid (commonly known as formic acid). - The methyl group (–CH\(_3\)) indicates that this is an ester formed from methanoic acid and methanol. - Thus, the correct IUPAC name for H-CO\(_2\)CH\(_3\) is **methyl methanoate**. ### Step 2: Analyzing CH\(_\equiv\)CH 1. **Structure Identification**: - The formula CH\(_\equiv\)CH indicates a carbon-carbon triple bond. - This structure represents an alkyne, specifically ethyne (commonly known as acetylene). 2. **IUPAC Naming**: - The simplest alkyne with two carbon atoms is ethyne, which is named based on the two carbon atoms (eth-) and the presence of a triple bond (-yne). - Therefore, the correct IUPAC name for CH\(_\equiv\)CH is **ethyne**. ### Conclusion Now that we have identified the correct IUPAC names for both compounds: - H-CO\(_2\)CH\(_3\) is **methyl methanoate**. - CH\(_\equiv\)CH is **ethyne**. ### Evaluating the Options Now, let's evaluate the provided options: - **A. Methyl methanoate and ethene**: - The first part is correct (methyl methanoate), but the second part is incorrect. CH\(_\equiv\)CH is ethyne, not ethene (which has a double bond). - **B. Metanoic acid and ethyne**: - The first part is incorrect. H-CO\(_2\)CH\(_3\) is methyl methanoate, not metanoic acid. Metanoic acid would be HCOOH. - **C. Ethyl methanoate and ethyne**: - The first part is incorrect. H-CO\(_2\)CH\(_3\) is methyl methanoate, not ethyl methanoate (which would have an ethyl group). - **D. Methyl methanoate and ethyne**: - This option is correct. H-CO\(_2\)CH\(_3\) is methyl methanoate, and CH\(_\equiv\)CH is ethyne. ### Final Answer The correct option is **D. Methyl methanoate and ethyne**. ### Revision Summary - **H-CO\(_2\)CH\(_3\)** is named **methyl methanoate** (an ester). - **CH\(_\equiv\)CH** is named **ethyne** (an alkyne). - The IUPAC naming system prioritizes functional groups and the structure of the compound. - Understanding the structure of organic compounds is crucial for accurate naming.