(a)
Interpretation: The explanation for the conversion of A to B is to be stated.
Concept introduction:
(b)
Interpretation: The two products formed by dienyne metathesis of C are to be drawn.
Concept introduction: Alkene metathesis generally known as olefin metathesis occurs in the presence of Grubbs catalyst. The ring-closing metathesis (RCM) by Grubbs catalyst occurs, when the starting material is diene. This reaction is facilitated under the high-dilution condition as it favors intramolecular metathesis instead of intermolecular metathesis.
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Organic Chemistry
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