I did an organic chemistry lab where I purified a sample ofcrude biphenyl. The following questions are in regard to thelab.
a. More polar solvents move molecules more rapidly than lesspolar solvents. If you used a 1:1 hexanes: methanol instead of the4:1 hexanes:ethyl acetate, would the products elute fater orslower? is the mixture of 1:1 hexanes:methanol a good choice as aneluent with biphenyl?
b. Why do impure compounds have lower melting points than thepure samples? Explan in molecular terms using biphenyl as anexample. (we removed methyl orange from biphenyl)
c. Naphthalene has a melting point of 80.3 degrees Celcius. Isthat higher or lower than the melting point of biphenyl? Explainthe answer in molecular terms (biphenyl has 2 rings connected witha bond and Napthalene is 2 fused rings)
