Consider the following sequence of reactions to produce major product (A) [figure] Molar mass of product (A) is g mol-1. (Given molar mass in g mol-1 of C : 12, H : 1, O : 16, Br : 80, N : 14, P : 31)
Answer
171
Solution
Concept: Br2/Fe brominates ring, Sn/HCl: -NO2 -NH2, NaNO2/HCl: diazonium, H3PO2: -N2+ -H.
[figure]
[figure]
∴ (A) = bromotoluene C7H7Br (the -NO2/-NH2 director is removed, so isomer does not matter).
Molar mass =84+7+80=171 g mol-1
Answer: 171