What is the prefix of an ester group?

The correct $IUPAC$ name of $CH_3-CH_2-C(=CH_2)-COOH$ is:

Give the $IUPAC$ names of the following compounds:
$(i)$ $Ph-CH_2-CH_2-COOH$
$(ii)$ $(CH_3)_2C=CH-COOH$
$(iii)$ Structure of $2-$Methylcyclopentanecarboxylic acid
$(iv)$ Structure of $2,4,6-$Trinitrobenzoic acid

The $IUPAC$ name of the compound with the formula $CH_3-C(CH_3)_2-CH=CH_2$ is:

Explain with examples: $(a)$ Complete,$(b)$ Condensed,and $(c)$ Bond-line structural formulas.

Give the $IUPAC$ name of the following compound: