Devise the most efficient synthesis for the carboxylic acid below using a starting material and reagents from the tables. Give your route by specifying the number of the starting material followed by the letters of the reagents you would use beginning with the first step. The answer 4fh means treat t-butanol(4) with conc. HCl(f) then treat the product with KOH in alcohol(h).
OH HO b) NEC. OH OH Starting materials Br H3C OH Reagents a Mg dry ether b 1. CO2 2. acidic workup c NaCN THF or DMF d NaCN dil. aqueous H2SO4 Br OH Br OH e Aqueous H2 at reflux f Conc HCI or HCI (gas) g PBr3 h KOH alcohol OH i KMnO4 H30 j Na2 Croa aqueous HoSO k 1. BH3 THF 2. H202aq. NaOH