Question

Pre-lab:
If your unknown was 2-bromooctanoic acid, what would you expect the results of the following tests to be?
Solubility in:

H2O	NaOH	NaHCO3	HCl	H2SO4

Jones Oxidation Test:

2,4-DNP Test:

Flame Test:

Beilstein Test:

Answer 1

H2O – Insoluble

NaOH – Soluble

NahCO3 – Ssoluble

HCl – Insoluble

H2SO4 – Insoluble

Organic acids don’t soluble in water and acids but they soluble in aqueous NaOH and NaHCO3.

Jones Oxidation Test: won’t work on 2-bromooctanoic acid.

It won’t work on acids because in Jones Oxidation reaction primary alcohols convert in to acid and secondary alcohols convert into ketone.

2,4-DNP Test: won’t work on 2-bromooctanoic acid.

Aldehydes and ketones are identified by using 2,4-DNP test. Acids won’t react with 2,4-DNP.

Flame Test: From this test, we can identify whether the compound is aromatic and aliphatic. Aliphatic compounds give luminous flame and aromatic compounds give sooty flame. 2-bromooctanoic acid aliphatic compound so it gives luminous flame.

Beilstein Test: We can identify halide compounds from this test. In this test halide compounds give copper halide. Beilstein Test is positive for 2-bromooctanoic acid and gives copper bromide.