Question

(b) $h_3c - hc - ch_2 - nh - ch_2 - ch - ch_3$

Explanation:

An amine is an organic compound with a nitrogen - containing functional group. In the given structure, there is an - NH - group. Alkynes have a carbon - carbon triple bond ($\ce{C\equiv C}$), ketones have a $\ce{C=O}$ group (carbonyl) with two alkyl groups attached to the carbonyl carbon, alkanes are saturated hydrocarbons ($\ce{C - C}$ single bonds only), ethers have an $\ce{O}$ atom between two alkyl groups ($\ce{R - O - R'}$), aldehydes have a $\ce{C=O}$ group with at least one $\ce{H}$ attached to the carbonyl carbon, alkenes have a carbon - carbon double bond ($\ce{C=C}$), alcohols have an $\ce{-OH}$ group, esters have a $\ce{R - COO - R'}$ group, aromatic compounds have a benzene - like ring structure, and carboxylic acids have a $\ce{-COOH}$ group. Since the given compound has an - NH - group, it is an amine.

Answer:

amine