Which functional group is present in methyl ethanoate?

The structural formula of benzene is:

Why do carbon compounds not conduct electricity?

State the two properties of carbon which make it unique among other elements. State the two uses of carbon which are based on its unique property.

What is the role of the metal or reagents written on the arrows in the given chemical reactions?
$(a)$
$(b)$ $CH_{3}COOH + CH_{3}CH_{2}OH \xrightarrow{Conc. H_{2}SO_{4}} CH_{3}COOC_{2}H_{5} + H_{2}O$
$(c)$ $CH_{3}CH_{2}OH \xrightarrow[Heat]{Alkaline KMnO_{4}} CH_{3}COOH$

What is a functional group? Give examples of four different functional groups.