Ethyl bromide reacts with lead-sodium alloy to form

Given data : It is given to identify ethyl bromide reacts with lead-sodium alloy to form.

Explanation :

Tetraethyl lead, abbreviated TEL, is an organo lead  $Pb\left(C_2{H}_5\right)$. It is also known as tetraethyl lead. It is a fuel additive that was first added to gasoline in the 1920s as a proprietary octane rating enhancer to allow engines to run at significantly higher compression levels.

Tetra ethyl lead [TEL] is produced when lead sodium alloy is combined with ethyl bromide. To improve their effectiveness and performance, TEL is employed. 

Hence, the correct option (A).  Tetraethyl lead.