(b)
$CH_{3}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ CH_{3}$
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$CH_{3} - C - Br + CH_{3}ONa \longrightarrow CH_{3} - C =$
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$\ \ \ \ \ \ \ \ \ \ \ \ \ CH_{3}$ $CH_{2} + {CH}_{3}OH + NaBr$
t-butyl bromide sodium 2-methyl propene methanol
methoxide (isobutylene)