Which of the following is one way to prevent the corrosion of iron?
a. paint exposed iron p21 with protective paint.
b. protect the iron from polluted air.
c. add carbon to the iron.
d. let the iron develop a natural coat of carbonate.

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.

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