How should I proceed with the reactions?

[Gourab_chill]

Homework Statement

I put the question in the form of a picture/attachment below.

Relevant Equations

--no equations i think--

The question:

How will the first reaction take place for instance? Is CH3S- the nucleophile? Will it be added to the oxygen and the other hydrogen(H+) get attached to the other oxygen, with the double bond shifting to the center(C2-C3)? If this is right then where will CN- will attack?

 

[TeethWhitener]

How will the first reaction take place for instance?

The problem statement tells you that it's a 1, 4 addition. Can you describe what that means?

Is CH3S- the nucleophile?

Yes. Start with those pieces of information and see what you can come up with.