Question

select alkenes and alkynes from the following
C2H4,C3H4,C2H2,C4H8
write their structural formula also
class 10 chemistry chapter 4​

Answer 1

Answer:

Solution

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The general molecular formula of alkenes and alkynes containing 'n' number of carbon atoms is C

n

H

2n

and C

n

H

2n−2

Using one these see that,

Alkenes : C

6

H

12

,C

2

H

4

,C

4

H

8

Alkynes: C

3

H

4

,C

5

H

8

Note that molecular formula alone is not sufficient to uniquely identify a compound.

For example, C

6

H

12

can mean hexane (unsaturated hydrocarbon) as well as cyclohexane (saturated cyclic hydrocarbon).

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Answer 2

The general molecular formula of alkenes and alkynes containing 'n' number of carbon atoms is C
n
​
H
2n
​
and C
n
​
H
2n−2
​


Using one these see that,

Alkenes : C
6
​
H
12
​
,C
2
​
H
4
​
,C
4
​
H
8
​


Alkynes: C
3
​
H
4
​
,C
5
​
H
8
​


Note that molecular formula alone is not sufficient to uniquely identify a compound.

For example, C
6
​
H
12
​
can mean hexane (unsaturated hydrocarbon) as well as cyclohexane (saturated cyclic hydrocarbon).
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