Identify whether each of the following hazardous compounds will be more likely to serve as an electron donor or electron acceptor during biological degradation.

a. TNT (a common explosive; suspected carcinogen, causes liver damage).

b. Trichloroethylene (used as a common degreaser and solvent; suspected carcinogen, causes liver damage).

c. Pyrene (a component of coal tar, crude oil, and soot; suspected carcinogen).

d. Triclosan (a common antibacterial for personal use now found in most rivers and streams – not sure of harmful effects but it does react to form a dioxin when exposed to light).

e. Carbon tetrachloride (used as a fumigant, industrial solvent; suspected carcinogen, causes liver damage).

f. Benzene (a component of gasoline; carcinogen).