Final answer:
Amines are characterized by a nitrogen atom bonded to hydrocarbon groups, with primary, secondary, and tertiary amines differing by the number of attached hydrocarbons. Compounds 1 and 3 based on the interpretation of their structures appear to be amines, where compound 1 could be a secondary amine and compound 3 is a tertiary amine.
Step-by-step explanation:
To determine which of the listed compounds are amines, one should look for the characteristic functional group of an amine: a nitrogen atom bonded to hydrocarbon groups. Amines can be classified based on how many of the hydrogen atoms in an ammonia (NH3) molecule have been replaced with organic groups (alkyl or aryl groups).
A primary amine has one hydrogen replaced (RNH2).
A secondary amine has two hydrogens replaced (R2NH).
A tertiary amine has all three hydrogens replaced (R3N).
Examining the compounds:
H4C-NH-CH3 - This structure is not clearly written, but it likely intends to represent a primary amine with the formula CH3NHCH3, which is a secondary amine.
H3C-NH-C-CH3
H2C-CH3 - The intended structure seems to be missing some connections, making it unclear. If interpreted as H3C-NH-C(CH3)2, it would represent a primary amine (an incorrect rendition of isopropylamine).
1 +H3C-CH2-N-CH3
CH3 - This structure represents a tertiary amine (trimethylamine).
H4 - This is simply not a standard representation for an organic molecule, and it does not define any amine-related structure.
Therefore, based on a guess about their intended structures, compound 1 could be a secondary amine, and compound 3 is definitely a tertiary amine.