Final answer:
To identify the unknown compound, perform a melting point determination using the samples of the known compounds. Compare the melting point of the unknown to the known compounds' melting points to identify a match.
Step-by-step explanation:
To identify the unknown compound, you can perform a melting point determination using the samples of the three known compounds. First, obtain a small amount of each known compound and measure their melting points. Compare these values to the melting point of the unknown. If the melting point of the unknown matches one of the known compounds, then you can conclude that the unknown is that particular compound.
To perform the melting point determination, take a small amount of the unknown compound and insert it into a capillary tube. Place the capillary tube in a melting point apparatus and heat it gradually until the compound melts. Monitor the temperature at which the melting occurs. Record this temperature as the melting point of the unknown.