WorksheetsCarbonyl chemistry - OCR GCE Chemistry A Level
Total questions: 24
Worksheet time: 17mins
In the balanced equation for aldehyde oxidation, how many moles of water are produced per mole of aldehyde?
0
0.5
1
2
How many carbonyl groups are there, in total?
(a)
Which is the correct structural formula for ethanal?
CH3COOH
CH3COH
CH3CHO
CH3COCH3
Which show correct skeletal formulae?
a
b
c
d
Name (d)
(a)
Name (c)
(a)
Which compounds are chemically implausible?
a
b
c
d
Name (c)
(a)
Name the compound
(a)
Name the compound
(a)
How many compounds would produce a positive test result with 2,4-DNP?
(a)
Which would produce a silver mirror when warmed with Tollens Reagent?
a
b
c
d
e
What is ammoniacal silver nitrate more commonly called?
(a)
Which correctly describes the observation when (a) is warmed with Tollens Reagent?
Orange ppt
Orange precipitate
Silver mirror
No observable reaction
Which correctly describes the observation when (a) is warmed with 2,4-DNP?
Orange ppt
Orange precipitate
Orange percipitate
No observable reaction
How many ketone groups are there in total?
(a)
What type of reaction takes place when NaBH4 reacts with ethanal?
Nucleophilic substitution
Electrophilic substitution
Electrophilic addition
Nucleophilic addition
Dehydration
What is the bond angle around C=O?
90 degrees
104.5 degrees
107 degrees
109.5 degrees
120 degrees
How can an unknown carbonyl compound be identified without spectroscopy?
1) Add 2,4-DNP: an orange ppt confirms a carbonyl compound
2) Add Tollens Reagent to the orange ppt: a silver mirror means it's an aldehyde, no reaction means it's a ketone
3) Recrystalise and dry the orange ppt
4) Take its mp and compare with reference data
1) Add 2,4-DNP: an orange ppt confirms a carbonyl compound
2) To a fresh sample, add Tollens Reagent: a silver mirror means it's an aldehyde, no reaction means it's a ketone
3) Recrystalise and dry the orange ppt
4) Take its bp and compare with reference data
1) Add 2,4-DNP: an orange ppt confirms a carbonyl compound
2) Add Tollens Reagent to the orange ppt: a silver mirror means it's an aldehyde, no reaction means it's a ketone
3) Recrystalise and dry the orange ppt
4) Take its bp and compare with reference data
1) Add 2,4-DNP: an orange ppt confirms a carbonyl compound
2) To a fresh solution, add Tollens Reagent. A silver mirror means it's an aldehyde, no reaction means it's a ketone.
3) Recrystalise and dry the orange ppt
4) Take its mp and compare with reference data
A chemist wants to distinguish between propanal and propanone.
What reagent should she add, and what observation is expected?
Tollens Reagent: silver mirror with propanal, orange ppt with propanone
2,4-DNP: orange ppt with propanone, no reaction with propanal
Tollens Reagent: silver mirror with propanal, no reaction with propanone
2,4-DNP: silver mirror with propanal, no reaction with propanone
What is produced when this aldehyde reacts with NaBH4?
Butanoic acid
Butan-1-ol
Butan-1-al
2-hydroxypentanenitrile
How many marks would be lost for the following answer?
0
1
2
3
What kind of fission is shown?
Heterolytic
Homolytic
Radical
There is no fission
Name the product
(a)
