Question

$t-BuOK+(C{H}_3{)}_{2}CH-CH(Br)-C{H}_3\stackrel{t-BuOH}{\to }$
Total number of hydrogen atoms attached to $s{p}^2$ carbon(s) in the major product:

Answer 1

In the reaction, $\beta$-elimination takes palce. $t-BuOK$ being strong and bulkier base, will abstract proton from less hindered side.