1. The problem statement, all variables and given/known data what would be the good method and solvent to purify biphenyl contaminated with fluorene? 2. Relevant equations 3. The attempt at a solution The polarity of biphenyl (MP: 68.93°C) and fluorene (MP: 116-117°C ) are same which is non polar but their MP is hugh different. So, I'm not so sure which solvent is good to use. I think cryatallization would be the good method to purify. Could you help on this? Thank you so much.