Which of the following groups of elements is ranked from least reactive to most reactive? Group of answer choices

K, Na, Li, H

K, Ca, Sc, Ti

Sr, Ca, Mg, Be

Li, Na, K, Rb

that tool would be a compass

bcde is the incorrect answer it is a

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.