How many forms of benzaldoxime exist?

Geometrical isomerism can be found in which of the following?

Which of the following can show geometrical isomerism?

Which isomer,$cis$ or $trans$,has a lower boiling point? Explain with an example.

Draw $cis$ and $trans$ isomers of the following compounds. Also write their $IUPAC$ names:
$(i)$ $CHCl=CHCl$
$(ii)$ $C_{2}H_{5}C(CH_{3})=C(CH_{3})C_{2}H_{5}$

The number of geometrical isomers for $CH_3CH=CH-CH=CH-CH=CHCl$ is .............