We saw two different reactions involving ylides as reagents.
(a) The Wittig reaction involved a phosphonium ylide reacting with a carbonyl. Draw both resonance structures of one example of a phosphonium ylide.

(b) We also saw a reaction involving a sulfonium ylide reacting with a carbonyl. Draw both resonance structures of the sulfonium ylide.

(c) Looking at your answers to (a) and (b), define the term “ylide”.

(d) What is the main difference between the reaction of a carbonyl with a phosphonium ylide vs. with a sulfonium ylide?