Question #0c15a

1 Answer
Apr 30, 2017

Answer:

Here is my explanation.

Explanation:

Resonance is the ability of a molecule (or ion or free radical) to be represented by more than one reasonable Lewis structure that differ only in the location of the π electrons

An example is the acetate ion, which has two equivalent resonance structures.

www.chemteam.info

In the English language, mesomerism is an old term for resonance.

The mesomeric effect is the electron-donating or electron-withdrawing effect of a group because of resonance.

For example, carbon 3 in propenal has a slight positive charge because the aldehyde group withdraws electrons through resonance.

The aldehyde group has a –M effect.

-M effect
(From Difference Between)

Similarly, carbon 4 in 1 methoxy-1-3 butadiene has a partial negative charge because the methoxy group donates electrons through resonance.

The methoxy group has a +M effect.

upload.wikimedia.org