3.3.6-organic Analysis

Question 1

What is test for primary /secondary alcohols and aldehydes

Answer 1

Add acidified potassium dichromate

Orange to green

Question 2

Test for alkene

Answer 2

Add Bromine water

Orange to colourless

Question 3

2 Tests for aldehyde

Answer 3

Tollens reagent
Colourless solution to silver mirror

Fehlings
Add and turn blue to red

Question 4

Test for haloalkanes

Answer 4

Add NaOH
Acidified with HNO3
Add AgNO3

Chlorine -white
Bromine -cream
Iodine -yellow

Question 5

Test for carboxylic acids

Answer 5

NaHCO3/Na2CO3
Give effervescence

Litmus paper
Turns red

Question 6

What can be determined from low resolution mass spectrometry

Answer 6

Mr but can not determine molecular formula

Question 7

What can be determined from high resolution mass spectrometry

Answer 7

Show mr to 4 decimal places so can determine molecular formula but can not always determine compound as some have sane molecular formula

Question 8

What is infrared spectroscopy

Answer 8

Bonds in a molecule absorb infrared radiation and produce a graph so can identify functional groups

Question 9

What is finger print region

Answer 9

Unique to every compound so can identify them

Question 10

How can you identify impurities

Answer 10

Use spectra of pure compound and compare to impure compound