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# How can I draw a possible structure of C2H4?

Here's one way to figure out the structure:

**1.** Write all possible connections for the carbon atoms.

C-C

**2.** Add the H atoms.

Put two H atoms on each C.

**3**. Count the number of , ##V##, you actually have available.

##V## =2C + 4H = 2×4 + 4×1 = 12.

**4.** Calculate ##P##, the number of π electrons there must be in the molecule:

##P = 6n + 2 – V##

where ##n## is the number of **non-hydrogen atoms** in the molecule.

##P## = 6×2 + 2 - 12 = 2 π electrons. So there is one double bond in the molecule.

**5.** Draw the new structure.

This time insert the double bond.

And you have the structure.

Here's another way to develop the structure.