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 |
|
|
|