Draw the expected product for the given reaction.

Give the final product of the reaction shown below.

Determine the structure of the compounds corresponding to i-iv for each of the following reactions:

Draw the mechanism for the reaction of 3-methylbutanoic acid and oxalyl chloride to form 3-methylbutanoyl chloride. The mechanism is similar to that of the reaction of thionyl chloride (SOCl₂) with a carboxylic acid. It starts with the formation of a mixed acid anhydride intermediate. This anhydride undergoes nucleophilic acyl substitution by the chloride ion, to remove the leaving group which further breaks into carbon dioxide, carbon monoxide, and chloride ion.