organic analysis

Question 1

how can the presence of alkenes be tested

Answer 1

by adding a few drops of bromine water and shaking, the solution will go from orange to colourless

Question 2

how can the presence of haloalkanes be tested

Answer 2

add dilute nitric acid and silver nitrate and a coloured precipitate will form

Question 3

how can aldehydes be tested with tollens reagent

Answer 3

warming the sample with pollens reagent will form a silver mirror if the aldehyde is present

Question 4

what is pollen’s reagent

Answer 4

tollens reagent is made by dilute sodium hydroxide to a colourless silver nitrate forming a light brown precipitate, then dilute ammonia solution is added to dissolve the brown precipitate forming a colourless solution,

Question 5

can aldehydes be tested with feelings solution

Answer 5

warm the solution will turn the solution turn solution from blue to dark red precipitate if an aldehyde is present

Question 6

how can carboxylic acid be tested

Answer 6

by adding a metal carbonate, if carboxylic acid is pretty it will form co2 it will turn limewater cloudy

Question 7

how can alcohols be tested

Answer 7

add potassium dichromate- if primary or secondary the solution will turn green