WM 2.0

Question 1

why is ethanol soluble but not hexanol

Answer 1

Hydrogen bonding between ethanol and water molecules make alcohols soluble. As the hydrocarbon chain gets longer, the importance of the -OH group relative to that of the alkyl group becomes less and hexanol is unable to mix with water

Question 2

what will happen if an aromatic alcohol is exposed to excess refluxed potassium dichromate solution

Answer 2

If benzene ring present, despite being alcohol, will not turn green with excess refluxed potassium dichromate solution.

Question 3

how to determine wavelength from wavenumber/absorption

Answer 3

1 over wavenumber = wavelength

Question 4

outline 4 steps to recrystallisation

Answer 4

Dissolve solute in minimum quantity of hot solvent
Allow to cool and crystallise
Filter off the crystals and wash with a small amount of cold solvent
Dry the crystals

Question 5

principles used to reduce waste products in industry

Answer 5

Better atom economy
Prevention of waste products
Reduce reagents and steps
Use more selective catalysts