carbonyls

Question 1

carbonyls refers to molecules with which two functional groups

Answer 1

Aldehyde and ketone (C=0)

Question 2

which test is used to carbonyls
and positive result

Answer 2

Bradys reagent(2,4-DNP)
gives a yellow/orange precipitate

Question 3

what colour is Bradys reagent

Answer 3

Orange solution

Question 4

which carbonyl can be oxidised using acidified K2Cr207

Answer 4

Aldehyde can be oxidised to form a carboxylic acid with no bi product

Question 5

what change is seen when a carbonyl is oxidised using acidified K2Cr2O7 and heat

Answer 5

orange solution to green solution

Question 6

what test can be used to distinguish between ketone and aldehyde carbonyls
give result(s)

Answer 6

Tollins reagent is used
silver mirror (silver precipitate) is formed when Aldehyde is present. Ketone does not have visible change

Question 7

How can you determine what carbonyl molecule is present in a sample

Answer 7

Bradys reagent test produces an orange/yellow precipitate which is a 2,4-dnp derivitave.

This solid can be used in a melting point test and compared against known malting points to determine what carbonyl has reacted to produce it. Boiling point can also be considered.