Select the appropriate reagent for the synthesis of tert-Butyl ethyl…

The correct answer is Option (4) → Ethy Ibromide and sodium tert-butoxide.

To synthesize tert-butyl ethyl ether, we need to use the Williamson ether synthesis:

$R-X + R'-O^- \rightarrow R-O-R' + X^-$

• To avoid elimination, the alkyl halide should be primary (or methyl), and the alkoxide can be bulky.
• tert-Butyl bromide is tertiary, prone to elimination if used as the halide.
• Use primary halide (ethyl bromide) and tert-butoxide ion to get tert-butyl ethyl ether.

 Correct combination: Ethyl bromide + sodium tert-butoxide