Compound a and compound b are constitutional isomers with molecular formula c4h9cl. treatment of compound a with sodium methoxide gives trans-2-butene as the major product, while treatment of compound b with sodium methoxide gives a different disubstituted alkene as the major product. draw the structure of compound a.

Compound A will be 2-chloro-butane which in the presence of sodium methoxide will undergo the elimination of the halogen with a hydrogen from the neighboring atom carbon (not the one with which the halogen in bound),  which have less hydrogen atoms, forming the trans-2-butene.

is it a purebred? it looks more like a red nose, but it doesn't have the red could it be a staffordshire bull terrior? unsure if that's the right name for it sorry