Which of the following is an appropriate unit to measure large distances across the solar system? astronomical unit meter square mile year

Distances in space could be measured in common units of length, such as miles or kilometers. But measuring such large distances in these common units creates some pretty big numbers. It's easier to measure distances in two alternate units of distance- light years and astronomical units.

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The correct answer is Astronomical Unit.

Explanation:

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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.