Chemistry - Halogen Derivative Question with Solution | TestHub

$\mathrm{A}=$ conc. ${\mathrm{RO}}^{-},80^{\circ }\mathrm{C},\mathrm{B}=\mathrm{HBr}/{\mathrm{CH}}_3\mathrm{COOH},20^{\circ }\mathrm{C}$

$\mathrm{A}=$ dil. aq. ${\mathrm{OH}}^{-},20^{\circ }\mathrm{C},\mathrm{B}=\mathrm{HBr}/{\mathrm{H}}_2\mathrm{O},20^{\circ }\mathrm{C}$

$\mathrm{A}=$ dil. aq. ${\mathrm{OH}}^{-},20^{\circ }\mathrm{C},\mathrm{B}=\mathrm{HBr}/{\mathrm{CHCl}}_3,0^{\circ }\mathrm{C}$

$\mathrm{A}=$ conc. ${\mathrm{RO}}^{-},80^{\circ }\mathrm{C},\mathrm{B}={\mathrm{Br}}_2/{\mathrm{CHCl}}_3.0^{\circ }\mathrm{C}$