Propose reasonable syntheses of each of the following alkynes, using the principles of retrosynthetic analysis. Each alkyne functional group in your synthetic target should come from a separate molecule, which may be any two-carbon compound (e.g., ethyne, ethene, ethanal).

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OH (d) (CH3),CC=CH [Be careful! What is wrong with (CH3);CCI + :C=CH?] (a) (b) (c) ÓH