Problem: Given the skeleton structure shown below, what is(are) the correct Lewis electron dot structure(s)? For this question, neglect the formal charges on each atom. 

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For the Lewis structure of C2H4, we must consider that C has a bonding preference of 4 and H with 1. In this case, there are only 4 Hs for the whole molecule so there should be multiple bonds between the 2 Cs. For this example, they must have 2 double bonds between them which is displayed by the 4th structure.

1st structure is incorrect since it suggests triple bond between the Cs which is not valid cause it will cause 5 bonds instead of 4 for C

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Given the skeleton structure shown below, what is(are) the correct Lewis electron dot structure(s)? For this question, neglect the formal charges on each atom. 

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