The $IUPAC$ name of the given compound is:

The $IUPAC$ name of the following compound is:

The $IUPAC$ name of the given compound is:

The $IUPAC$ name of acraldehyde is

Fill in the blanks:
$(1)$ ....... model indicates only bonds in a molecule.
$(2)$ Only ......... model of a molecule indicates both bonds as well as atoms.
$(3)$ In the nomenclature of cyclic compounds,the ....... prefix is written before the name of the simple chain containing alkane.
$(4)$ The names of $C_{20}H_{42}$ and $C_{30}H_{62}$ are ........... and .......... respectively.

Write $IUPAC$ and common name of the following:
$(i)$ $HCOOH$
$(ii)$ $CH_2Cl_2$
$(iii)$ $CHCl_3$
$(iv)$ $ClCH_2COOH$
$(v)$ $(COOH)_2$