Chemical compounds that contain the –nh2 functional groups are

amides
esters
alcohols
amines

amines

Explanation:

amides –CONH2

esters -COOR

alcohols -OH

amines –NH2  

Hence Chemical compounds that contain the –NH2 functional groups are amines  

Functional group:

The properties of organic compounds are depending on some groups of atom, which is known as functional group. Thus, the compounds, which have same functional group, have similar properties.

For example if the compound contains at least one double bond means it is an example  of alkene.

2b2t

explanation:

2b2t

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.