A given unknown had a MP 182-185°C, and to determine its identity, its MP was me

Question

A given unknown had a MP 182-185°C, and to determine its identity, its MP was measured as a mixture of two compounds and gave the following MP ranges: Compound A and the unknown: 176-184°C Compound B and the unknown: 178-185°C Compound C and the unknown: 170-181°C Compound D and the unknown: 184-185°C Th e MP of the pure compounds A-D was used as a control and compared to literature values: Compound A only: 181-184 C Compound B: 184-187 C Compound C only: 182-183 C Compound D only: 184-185°C according to the data, would the unknown be the same as compound A B C, or D? O Compound D Compound A Compound C

Explanation / Answer

The mixture of unknown compound and compound D has the same melting point as that of pure compound D. Mixture of unknown compound with other compound except compound D,gives the melting point of mixture lesser than that of both the components,given as well as unknown which means that unknown compound is not same as the given compound. Thus,unknown compound would be same as compound D

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