Last minuite

Question 1

Give an equation for the preparation of 1,6-diaminohexane by the reaction of
1,6-dibromohexane with an excess of ammonia.

Answer 1

-Br-(CH2)6-Br + 4NH3 → H2N-(CH2)6-NH2 + 2NH4Br

Question 2

Suitable reagent for the hydrolysis of a protein

Answer 2

-conc HCL

Question 3

Why might it be necessary to use two different solvents?

Answer 3

some amino acids have the same Rf value

Question 4

What produces a positive test with acidified potassium dichromate?

Answer 4

-Primary and secondary alcohols and aldehydes

Question 5

Explain the purpose of adding a small amount of cold ethanol.

Answer 5

-to remove soluble impurities

Question 6

Describe two important precautions when heating the mixture of ethanol and crude
aspirin.

Answer 6

-(Ethanol is flammable so) use a water bath to heat / do not use a Bunsen burner
-Heat to temp below bp

Question 7

Suggest two ways in which the melting point of the crude aspirin collected in step 9
would differ from the melting point of pure aspirin.

Answer 7

-Value lower
-Range of values