Qualitative Analysis

Question 1

Test for Alkene and observations

Answer 1

Chemical test - add bromine water drop wise

Bromine water decolourised from orange to colourless

Question 2

Test for haloalkane plus observation

Answer 2

Add silver nitrate and ethanol and warm in a water bath

Cl - white
Br- cream
I- yellow

Question 3

Test for carbonyl plus observation

Answer 3

Add Brady’s

Orange precip

Question 4

Test for aldehyde plus observation

Answer 4

Add tollens

Silver mirror

Question 5

Test for primary secondary alc and aldehyde + observations

Answer 5

Add K2Cr2O7/H2SO4 and warm

Colour change from orange to green

Question 6

Test for carboxylic acid + observation

Answer 6

Add aq sodium carbonate

Effervescence

Question 7

Test for phenol and observation

Answer 7

They won’t react with sodium carbonate

Undergoes electrophilic sub with Br at room temp

Bromine is decoloirised and a white precip is formed