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Standard XII
Chemistry
Allotropes of Carbon
The hydrocarb...
Question
The hydrocarbons present in diesel are from:
A
C
15
t
o
C
18
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B
C
25
t
o
C
38
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C
C
35
t
o
C
58
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D
C
55
t
o
C
68
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Solution
The correct option is
A
C
15
t
o
C
18
Hydrocarbons present in
Gasoline
⇒
C
3
−
C
12
Napthalene
⇒
C
8
−
C
12
Kerosene/Jet fuels
⇒
C
11
−
C
14
Diesel & fuel oils
⇒
C
15
−
C
18
The hydrocarbons present in diesel are
C
15
−
C
18
.
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How many carbon atoms are there in the hydrocarbon molecules of diesel ?
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Q.
Fill in the blanks with appropriate words selected from those given below.
heights, condense, lower, bitumen, hydrocarbons,
high, fractional distillation, cool, fractionating column,
diesel oil, petrol, refinery, higher up, lower down
(a) Crude oil is made up of many different ___________. In an oil ___________, the hydrocarbons are separated into different products by a process called _____________ ___________. The crude oil is heated to a high temperature and passed into the____________ __________. As the vapours rise towards the top the different hydrocarbons ___________ at different ___________ and are withdrawn separately.
(b) Substances with _____________ boiling points condense first, in the column. Substances with ___________ boiling points condense ______________. Light products like ___________ are withdrawn from near the top of the column. Heavier products like ___________ and fuel oil are taken out lower down. The heaviest hydrocarbons, such as __________ are left at the bottom.
Q.
How many benzylic hydrogens are present in the hydrocarbon shown given?
Q.
Petrol and diesel are obtained from:
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