4.4 aldehydes and ketones

Question 1

How to test for both aldehydes and ketones and what type of reaction is it?

Answer 1

2,4 DNP
addition- elimination reaction as you are adding the 2,4 DNP but eliminating water
bright orange ppt indicates presence of c=o

Question 2

test for aldehyde:

Answer 2

tollens- silver mirror ppt
eq: ag+ + e- —> ag(s)
fehlings- brick red ppt
eq: cu2+ + e- —> cu+ (s)

Question 3

iodoform test:

Answer 3

pale yellow ppt
positive with a CH3- C = 0
and CH3- C -OH