Compound C4h10 Gives Two Different Monochlorides

Compound A (C4H10) gives two different monochlorides on photochemical chlorination. Treatment of either of these monochlorides with potassium tert-butoxide in dimethyl sulfoxide gives the same alkene B (C4H8) as the only product. What are the structures of compound A, the two monochlorides, and alkene B?

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