Question

Derive a series of reactions to convert benzene into metachlorobromobenzene. Select reagents and conditions from the following table, listing them in the order of use.
(1) sulphuric acid (cone.), heat
(2) $C{l}_2+FeC{l}_3$ and heat
(3) $NaN{O}_2+H_3{O}^{+},0^{O}C$
(4) $H_{2,}Pd/C$ catalyst
(5) $Mg$ in ether
(6) $PB{r}_3$
(7) $H_{3}P{O}_2$
(8) $HN{O}_3$ (cone.) $+H_{2}S{O}_4$ (cone.) and heat
(9) $C{u}_{2}B{r}_2+HBr$
(10) ${\left(C{H}_{3}CO\right)}_{2}O+$ pyridine

• A. 8 then 2 then 4 then 3 then 9
• B. 2 then 8 then 4 then 3 then 9
• C. 8 then 4 then 10 then 2 then 3 then 9
• D. 1 then 2 then 6

Answer 1

Answer: (A)

Correct answer is (a) 8 then 2 then 4 then 3 then 9