Question #dd0c0

1 Answer
Jan 4, 2015

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.

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3. Count the number of valence electrons, #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.

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And you have the structure.

Here's another way to develop the structure.