What is the product of each of the following reactions?
(a) The Rosenmund reaction reduces acid chlorides to form aldehydes.
(b) DIBAL reduces esters to form aldehydes.
(c) Phenyl lithium reacts with carboxylic acids to give ketones by adding a phenyl group to the carbonyl carbon atom of the carboxylic acid.
(d) Reaction of nitriles Grignard reagents gives ketones whose carbonyl group is the carbon of the original nitrile.