thin layer chromatography

Question 2

what is visualisation of TLC

Answer 2

where somethin needs to be done to temporarily see the comounds

Question 3

uses of TLC

Answer 3

to assess reaction progress to determine if reactants have been consumed to form a new product

Question 4

what is a co spot

Answer 4

where reactant and product are spotted on top of each other

Question 5

what is the retention factor

Answer 5

how chemists report the result of TLC plate , as R value, where the Rf = distance travelled by the compound/distance travelled by the solvent

Question 6

what does an Rf value of 0.55 mean

Answer 6

the spot moved 55% as far as the solvent front

Question 7

what is the order of elution on silica TLC plates

Answer 7

less polar is higher, more polar is lower

silica attracts polar compounds

Question 8

describe betweeb benzyl alcohol, benzaldehyde and ethylbenzene which will elute from TLC plate the quickest

Answer 8

benzyl alcohol = most polar - retained the most

benzaldehyde = moderately polar so can be carried further by the mobile phase

ethylbenzene = least polar - travels with mobile phase

Question 9

what are the functional groups polarity

Answer 9

increasing n polarity

alkanes
alkenes
aromatic hydrocarbons
ethers, halocarbons
aldehydes, ketones, esters
amines
alcohols
carboxylic acids

Question 10

is amide or amine more polar

Answer 10

amide is more polar, bc it can hydrogen bond and accept hydrogen bonds on oxyden and nitrogen

Question 11

structure of amide group?

Answer 11

has a carbonyl group bonded to nitrogen atom