Reaction review. Without consulting the Reaction Road Map on p. 914, suggest reagents to convert each of the following starting materials into hexanoic acid: (a) hexanal; (b) methyl hexanoate; (c) 1-bromopentane; (d) 1-hexanol: (e) hexanenitrile. 

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RCOR' RCH-OH RCH RC=N Oxidant (i.e., CrOs, KMNO4, Ag*, Cu", H;O:. HNO,, O,-Rh, Br2) CO2 Ht or OH, KCr:Or, H or OH, H*, H:O Other product: R'OH 8-5, 19-9, 17-14, 19-5, 19-6, 19-6, 20-8, 20-1, 20-4 8-6, 19-6 24-4, 24-9 19-6 26-2 R HO 20-1, 20-2 20-1, 20-3 20-1, 20-6, 22-2 24-5 26-6 26-5 Other product: CH; Product: Products: COOH HCOH +R'CH H* or -OH, KMNO4, -OH, A HIO4, H;O H* or OH, H2O H* or "OH, H;0, A H2, Pd-C H20 R' OH RCI RČOČR RČN HC-Ç-R' RCOCH. R"