[kelaklub]

The answer to the following question is choice D. I realize this as an Ozonolysis in the first step, but what is the purpose of the Zn in the second part and shouldn't it be incorporated into the product, or is it acting as a catalyst? Thanks.

[Albert]

Yes, Zn is oxidized to ZnO and you can call this kind of reaction an ozonolysis with  reductive work-up.

However, I think the exercise wants to focus on the two 'main' products (those you actually want to yield by performing the reaction).

[kelaklub]

OK. Thanks.

[Dan]

Side note, Me2S is also used instead of Zn, so don't be suprised if you see it in an ozonolysis Q.

[Will]

Another side note! H₂O₂ can be used in the work up to give the corresponding carboxylic acids, and if a reducing agent like NaBH₄ (Zn isn't strong enough) is used then you will get the corresponding alcohol.
Like Dan said, dimethylsulfide ((CH₃)₂S) is used to get the corresponding carbonyl (aldehyde/ketone) compounds. I would say dimethylsulfide is a more common reagent for this purpose, than Zn.

[movies]

Another relatively common reagent for a reductive work-up is PPh₃.  It works the same way as Me₂S and gives the two carbonyl products.