Do saturated and unsaturated hydrocarbons show similar observable positive results in all tests?
Transcribed Image Text:chloride
•Gas jar
•Dropper
jars which are
located in the
left and
observe the
changes
precipitate
formed
C. Precipitate Copper
is formed
acetylide
formed, alkyne
•Reagent rack
•3 gas jars
•Match
•Crucible tong
Using the
match box,
drag the
match stick
present
A. Same soot A is alkene
is formed
Ignition
Ignition test
B. No soot is Bis alkane
formed
upto the
mouth of the
3 gas jars to
in the right
side and
C. More soot Cis alkyne
is formed
observe the
ignition test
1. Do saturated and unsaturated hydrocarbons show similar observable positive
results in all tests?
No, saturated and unsaturated hydrocarbons show different observable
positive results
2. Which test can be used in identifying the different classes of hydrocarbons (e.
g. alkanes, alkenes and alkynes)? Why?
Transcribed Image Text:UNIT
VIRTUAL LAB REPORT #1
1
YOU TUBE LINK: You tube.com/watch?v = 9FNNoeuSVKO
TITLE: TESTS FOR HYDROCARBONS
Materials Used
Test
Procedure
Observable
Explanation
Positive
Result
Equipment /
Apparatus
Test
Reagent/
Chemical
A. Additional
•Reagent rack,
•Bottle
Only one
reagent at a
time, using a
dropper, drop
the reagent
into all the 3
A. Orange
colour of
Bromination
product form,
therefore
Bromine
dissolved in containing
carbon
tetrachloride
Bromine
Bromine
discharged
unsaturated
Solution
hydrocarbon
•Gas jar
•Dropper
B. No change
В.
is observed
No
gas jars for
reagents
which are
additional
product form,
therefore
saturated
hydrocarbon
C. Orange
colour of
located in the
left side and
abserve the
changes
Bromine is
discharged
c. Additional
product form,
therefore
saturated
hydrocarbon
A.
•Reagent rack
•Bottle
A. Purple
colour is
discharged
Additional
product form,
therefore
Alkaline
Using a
dropper, also
drop the
reagent into
all the 3 gas
permanganate jars which are
located in the
KMN04
Alkaline
potassium
containing
permanganate Alkaline
potassium
unsaturated
hydrocarbon
B. Purple
colour
perished
В.
No
•Gas jar
•Dropper
additional
product form,
therefore
saturated
hydrocarbon
left side and
observe the
C. Purple
colour
changes
discharged
C. Additional
product form,
therefore
unsaturated
hydrocarbon
Ammoniacal Ammoniacal
cuprous
chloride
•Reagent rack
•Bottle
containing
Ammoniacal
Using a
dropper, also
drop the
reagent into
all the 3 gas
A. No
cuprous
chloride
precipitate
formed
cuprous
B. No
Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .
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