Question

Hexachlorobenzene has a literature melting point of 231 ºC. What would be a reasonable result when melting an impure sample of hexachlorobenzene?

		It would start melting around 229 ºC and finish melting around 233 ºC.
		It would start melting around 225 ºC, and finish melting around 230º C.
		The impurity would melt at whatever temperature is normal for that impurity, but the hexachlorobenzene would melt right at 231 ºC .
		It would melt right at a temperature lower than the regular mp (maybe 229 ºC) or higher (maybe 234 ºC), depending on what the impurity was.
		It would melt right at 229 ºC .
		The listed melting point is an average, so it would melt from 230 ºC to 232 ºC, regardless of any impurities. Your melting point unknown has a melting range of 158 ºC to 159 ºC, so you're fairly sure it's salicylic acid. Which compounds should you do a mixed melting point with to confirm that this is indeed salicylic acid? Maleic acid Fluorene Fluorine All of them. Triphenylmethanol None- it's clearly salicylic acid, so we don't need to confirm it. Salicylic acid Cinnamic acid 2-Chlorobenzoic acid Urea trans-Stilbene Benzoic acid

Answer 1