WorksheetsOrganic reagents and colour changes
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
C5H12 + Br2 → C5H11Br + HBr
The reaction is
The reaction is
a)
slow and needs sunlight / heat
b)
fast and needs sunlight / heat
c)
fast
d)
slow
2.
C5H12 + Br2 → C5H11Br + HBr
The reaction is
The reaction is
a)
elimination
b)
substitution
c)
addition
d)
acid-base
3.
C5H10 + Br2 → C5H10Br2
using bromine water
The observations would be
using bromine water
The observations would be
a)
colourless to orange - rapid reaction - 2 layers
b)
orange to colourless - slow reaction - 2 layers
c)
colourless to orange - slow reaction - 2 layers
d)
orange to colourless - rapid reaction - 2 layers
4.
What type of reaction would occur between but-1-ene and HBr
a)
substitution
b)
addition
c)
oxidation
d)
elimination
5.
In an addition reaction between propene and HCl the major product is predicted by .....
a)
the rich get poorer
b)
the poor get richer
c)
the rich get taxed more
d)
the rich get richer
6.
In an addition reaction between propene and HCl
the major product would be
the major product would be
a)
1-chloropropene
b)
1-chloropropane
c)
2-chloropropane
d)
1,2-dichloropropane
7.
What conversion does this bring about?
H2O / H+, heat
H2O / H+, heat
a)
alkene to alkane
b)
alcohol to alkene
c)
alcohol to carboxylic acid
d)
alkene to alcohol
8.
What would be the minor product if this reaction occurred?
a)
propan-1-ol
b)
propan-2-ol
c)
propan-3-ol
d)
propanoic acid
9.
What colour is potassium permanganate, which contains the coloured ion MnO4- ?
a)
green
b)
colourless
c)
orange
d)
purple
10.
What is the colour change when potassium permanganate, which contains the ion MnO4- is shaken with an alkene with NO acid (H+) added
a)
purple stays purple
b)
purple to brown
c)
orange to green
d)
purple to colourless
11.
What is the colour change when acidified potassium permanganate, H+/ MnO4- is shaken with an alkene?
a)
purple stays purple
b)
purple to brown
c)
orange to green
d)
purple to colourless
12.
Ethanol is heated with H+/Cr2O72-.
The colour change AND product made are
The colour change AND product made are
a)
orange to green: ethanoic acid
b)
orange to colourless: ethane acid
c)
orange to green : ethane acid
d)
green to colourless: ethanoic acid
13.
KOH(aq) and KOH(alc) bring about very different reactions.
KOH(alc) converts
KOH(alc) converts
a)
haloalkane to alcohol (substitution)
b)
haloalkane to alcohol (addition)
c)
haloalkane to alkene (addition)
d)
haloalkane to alkene (elimination)
14.
KOH(aq) and KOH(alc) bring about very different reactions.
KOH(aq) converts
KOH(aq) converts
a)
haloalkane to alcohol (substitution)
b)
haloalkane to alcohol (addition)
c)
haloalkane to alkene (addition)
d)
haloalkane to alkene (elimination)
15.
To turn an alcohol R-OH into a chloroalkane R-Cl, the best chemical to use is
a)
Cl-
b)
Cl2
c)
PCl3
d)
SOCl2
16.
What type of reaction happens you heat a suitable corganic chamical with concentrated H2SO4?
a)
alcohol to alkane - elimination
b)
alcohol to alkene - elimination
c)
alkene to carboxylic acid - oxidation
d)
alkene to haloalkane - addition
17.
Which of these will turn moist red litmus blue?
a)
ethanol
b)
propene
c)
propanamine
d)
methanoic acid
18.
Which of these will turn moist blue litmus red?
a)
ethanol
b)
propene
c)
propanamine
d)
methanoic acid
19.
Which of these will produce bubbles of gas if a piece of Mg is added?
a)
hexane
b)
propanol
c)
propanamine
d)
ethanoic acid
20.
What colour does UI paper or solution turn if added to CH3CH2COOH?
a)
green to red
b)
green to orange
c)
green to blue
d)
green to purple
100 %
