Show how you would synthesize the following carboxylic acids, using the indicated starting materials.
(a) oct-4-yne → butanoic acid
(b) trans-cyclodecene → decanedioic acid
(c) bromobenzene → phenylacetic acid
(d) butan-2-ol → 2-methylbutanoic acid
(e) p-xylene → terephthalic acid
(f) allyl iodide → but-3- enoic acid