29 CCC Proportion What are the top three sources of U. S. electricity generation? Estimate the overall efficiency of U. S. electricity
generation. How does this compare to the efficiency for
transportation?

i think it is d. e because the next one is igneous.

try answer.com that works for me

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.