Which functional group is present in methyl ethanoate?

Vinegar is a solution of :

An atom of an element contains six electrons in its valence shell. This element is the second major component of air. It exists as a diatomic molecule.
$(i)$ Identify the element.
$(ii)$ Show the bond formed between two atoms of this element.
$(iii)$ Write the nature of the bond between the two atoms.

Write the $IUPAC$ names of the following compounds:
$(a)$ $CH_3-CH_2-CH_2-CH_2-CH_2-CH_2-CHO$
$(b)$ $CH_3-CH_2-CH_2-CH_2-CH_2-OH$

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.

Which of the following is the reaction occurring between alcohol and carboxylic acid in the presence of concentrated $H_{2}SO_{4}$?