Step 1: The carboxylic acid contains six carbons and the starting material should be an alkyl halide of five carbons or less, so
you should look for a method of generating carboxylic acids by adding a carbon.
One method of synthesizing carboxylic acids is from the hydrolysis of nitriles, which can be formed by substitution of
alkyl halides.
Identify the structure that contains a nitrile.
RCH=CHNH_(2)
CH_(3)CH_(2)NH_(2)
CH_(3)CH=NH
CH_(3)C-=N