module 6 ppqs

Question 1

26) describe what is happening to the electron pairs and bonds in step 1 of the nucleophilic addition mechanism [3]

Answer 1

1. electron pair on H- is attracted to δ+ carbon forming a dative covalent bond
2. double electron pair breaks
3. electron pair now on O-

Question 2

26) outline how to distinguish between an aldehyde and a ketone after 2,4-DNP [3]

Answer 2

1. recrystallise to purify the precipitate
2. measure melting point
3. compare with known values