Question

Follow the curved arrows and draw a Lewis structure for the resulting resonance contributor of 1,3-butadiene, adding charges and lone electron pairs to the appropriate atoms.

A) Continue
B) Draw
C) Erase
D) Skip

Answer 1

To draw a resonance contributor for 1,3-butadiene, start with the original Lewis structure, move π-electrons or lone pairs as indicated by curved arrows, adjust charges and ensure all carbon atoms have an octet.

Step-by-step explanation:

To draw a resonance contributor for 1,3-butadiene, you start with the original Lewis structure of the molecule and follow the curved arrows to move π-electrons or lone pairs without moving σ-electrons. Begin by drawing two double bonds between the first and second carbon atoms and between the third and fourth carbon atoms in 1,3-butadiene.

Next, if the curved arrows indicate that electrons from one of the double bonds are moving towards a neighboring bond, you will create a new double bond there while turning the original double bond into a single bond, and vice versa. Remember that you must also adjust the charges on the affected atoms accordingly, applying formal charge rules. Atoms that lose electron density will become positively charged, and those gaining electron density will become negatively charged.

After following these steps, ensure that each carbon atom maintains an octet of electrons. If an atom does not have a complete octet, you should consider moving a lone pair from a neighboring atom to form a double bond. This process might be required multiple times to achieve appropriate resonance structures.