| Qu1: |
How many α-hydrogens
are there in each of the following aldehydes and ketones ? |
| |
| (a) (CH3)2C=O |
(b) CH3CHO |
(c) H2C=O |
| (d) PhCHO |
(e) 2-pentanone |
(f) 3-pentanone |
|
| Qu 2: |
For each of the
following pairs of compounds, draw their enols tautomers and choose the
one the compound that has the greater enol content. |
| |
|
| Qu 3: |
Draw the stepwise
curly arrow mechanism for the tautomerisation of propanone with (i) and
acid catalyst, H3O+ and (ii) a base catalyst, HO- |
| |
|
| Qu 4: |
What are the
major products of the reactions of 1-phenylethanone (acetophenone) with
each of the following: |
| |
| (a) |
Bromine in acetic acid |
|
acetophenone
|
| (b) |
Iodine in sodium hydroxide
solution |
|
| (c) |
(i) NaOH then (ii) add
ethyl iodide |
|
| (d) |
Ethyl magnesium bromide
followed by acidic work up |
|
| (e) |
NaOH and methanal |
|
| (f) |
NaOH and benzaldehyde |
|
|
| Qu 5: |
What are the
major products of the reactions of 2-cyclohexenone with each of
the following: |
| |
| (a) |
NH3 in water |
| (b) |
Ethanethiol |
| (c) |
Lithium diethylcuprate
then acidic work-up |
| (d) |
Ethyl lithium then acidic
work-up |
|
|
|
