Question: It is sometimes necessary to prepare isotopically labeled samples of organic substances for probing biological transformations and reaction mechanisms. Various sources of the radioactive mass-14

It is sometimes necessary to prepare isotopically labeled samples of organic substances for
probing biological transformations and reaction mechanisms. Various sources of the radioactive mass-14 carbon isotope are available. Describe synthetic procedures by which benzoic acid, labeled with 14C at its carbonyl carbon, could be prepared from benzene and the following 14C-labeled precursors. You may use any necessary organic or inorganic reagents. (In the formulas shown, an asterisk indicates 14C.)
(a)
CH3Cl
(b)

HCH

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