how to separate grease compound found in commercial pet ether bp 60-80.

The residue i get when i evaporate pet ether should pass NMR test.

Suggest me purification steps.

i have tried lab distillation but the problem persists.

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

Using above information

Match the following 

 Dr. Ronald Lance is the greatest spell caster in the world also referred to as the most powerful saiki in the world by those who have used his powerful magic spells, weather you aiming at fixing your love, relationship or marriage, Ronald Lance is a real spells caster for your needs, bear in your mind that you are about to get in touch with our very experienced spells caster verified for casting authentic spells Call/Whats App+27634928462

Plz answer this query.....................................................................................................

how to represent the possible fischer projections for 2-bromohexane