Devise the most efficlent synthesis foc the carboxylic adid below using a starting material and reagents from the tables. Give your route by specifying the number of the starting mate followed by the letters of the reagents you would use beginning with the first step. The answer 4fh means treat fobutanol(4) with canc. HCl(f) then trest the preduct with KOH in alcohol(h). Startine materials Re The most effaent synthetic rovte is