Carbonyl Compound

Question 1

What happens if we add NH3 to a carbonyl

Answer 1

it replaces the O

Question 2

What happens if we add hydrazine to a carbonyl

Answer 2

replaces the O as well the H from the other end goes to form h20

Question 3

How can we distinguish a aldehydes from ketones?

Answer 3

1. Tollen’s reagent
2. Benedict/ Fehling solution

Question 4

Describe the tollen reagent and conditions

Answer 4

Ag+ is reduced to a ppt of Ag and the aldehyde is oxidized to a carboxlyic acid

Ag+

Question 5

Describe the benedict/ fehling sol

Answer 5

Cu2+ reduced to form a brick red ppt of CU0 (copper oxide and aledhyde is oxidised to cooh

ketones do not reacr

Question 6

Do a phenylhydrazine and brady reagent 2,4DNPH

Question 7

Describe the haloform reaction and reagent

Answer 7

Specific to an aldehyde or ketone that contains a -CH3 group directly attached to a carbonyl compound.

NaOH and I2 are added and aldehyde or ketone will give a positive result if they have CH3

Question 8

What colour does the haloform reaction do?

Answer 8

yellow ppt and CH3I (s)