15. Many organic compounds containing thiol groups (-SH) are antidotes for the heavy metal element mercury poisoning. For example, the antidote compound I produces compound II with mercuric oxide as shown below.
Compound III is also a mercury detoxifier. Compound IV is a strong acid. Which of the following statements is correct?
(A) In compound I, the S atoms take on sp hybridization.
(B) The electronegativity of the S element is the greatest in compound II.
(C) the C-C-C bond angle is 180° in compound III.
(D) There are ionic and covalent bonds in compound III.
(E) The bond energies of the sulfur-oxygen bonds are equal in compound IV.

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統計： A(0), B(1), C(0), D(3), E(0) #3847791