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SECTION B: Structured Questions ( 40 marks) Acetylene is a very important building block in organic synthesis reactions. (a) Devise the retrosynthesis for the following target molecules A and B from acetylene, indicate clearly "C-C" or FGI step and the synthons involved (if any). (b) Proposed the forward synthesis for both target molecules and indicate all reagents and intermediates required. Target molecule A (10 marks) Retrosynthesis for Target molecule A : Forward synthesis for Target molecule A : Target molecule B Retrosynthesis for Target molecule B : Forward synthesis for Target molecule B : SECTION B: Structured Questions ( 40 marks) Acetylene is a very important building block in organic synthesis reactions. (a) Devise the retrosynthesis for the following target molecules A and B from acetylene, indicate clearly "C-C" or FGI step and the synthons involved (if any). (b) Proposed the forward synthesis for both target molecules and indicate all reagents and intermediates required. Target molecule A (10 marks) Retrosynthesis for Target molecule A : Forward synthesis for Target molecule A : Target molecule B Retrosynthesis for Target molecule B : Forward synthesis for Target molecule B