Select the correct answer. What is the wavelength of radio waves?
A.
between 1 x 10-3 and 1 x 10-1 meters
B.
less than 1 x 10-11 meters
more than 1 x 10-4 meters
D.
between 1 x 10-8.4 x 10-7 meters
E.
between 4 x 10-7.7 x 10-7 meters
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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.