2.84

3.87

1.73

0.0

Homogeneous catalyst

Inhibitor

Promoter

Heterogeneous catalyst

$$ \begin{aligned} \mathrm{C}_6 \mathrm{H}_5 \mathrm{Br}+\mathrm{CH}_3-\mathrm{Br}+2 \mathrm{Na} \xrightarrow[\text { ether }]{\text { dry }} \mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}_3+2 \mathrm{NaBr} \end{aligned} $$

$$ \begin{aligned} 2 \mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}+2 \mathrm{Na} \xrightarrow[\text { ether }]{\text { dr }} & \mathrm{C}_2 \mathrm{H}_5-\mathrm{C}_2 \mathrm{H}_5+2 \mathrm{NaBr} \end{aligned} $$

$$ 2 \mathrm{CH}_3 \mathrm{Br}+2 \mathrm{Na} \xrightarrow[\text { ether }]{\text { dry }} $$$$ \,\,\mathrm{CH}_3-\mathrm{CH}_3+2 \mathrm{NaBr} $$

$$ \begin{aligned} 2 \mathrm{C}_6 \mathrm{H}_5 \mathrm{Br}+2 \mathrm{Na} \xrightarrow[\text { ether }]{\text { dry }} & \mathrm{C}_6 \mathrm{H}_5-\mathrm{C}_6 \mathrm{H}_5+2 \mathrm{NaBr} \end{aligned} $$