25. Which is a possible product of the chlorination of butane in the presence of light?
(A) $\mathrm{C_4H_9Cl}$
(B) $\mathrm{C_4H_7Cl}$
(C) $\mathrm{C_4H_{10}Cl_2}$
(D) $\mathrm{C_4H_6Cl_2}$

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