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2015-10-31T15:23:47+05:30

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In C2H2,
sigma bonds = 3
pi bonds = 2

In C2H4,
sigma bonds = 5
pi bonds = 1

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2015-10-31T16:19:50+05:30

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C2h4=======>    H   -  C   =   C-H
                                      |          |
                                    H          H 


it shows  that it has 5 sigma bonds and 1 pi bonds 

c2h2=================>   h-C ≡ C-h  
so it has 3 sigma bonds and 2 pi bonds 














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