To purify a solution of pyridine (b.p. 115 C) by distilation from ~5% benzene (b.p. 80 C) a distillation was performed and 5 fractions were collected and ~5 ml was left in the distillation pot, Listed below is the volume and temperature of each fraction collected. please circle the fraction(s) that you would label(s) as pure pyridine.

fraction 1 : 5ml, 80 C

fraction 2: 10 ml, 95C

fraction 3: 10 ml, 110 C

fraction 4: 150 ml, 115 C

fraction 5: 20 ml, 115 C