How many geometrical isomers are possible for $1,4$-dimethylcyclohexane?

Which of the following compounds will show $cis-trans$ isomerism?
$(i)$ $(CH_3)_2C=CH-C_2H_5$
$(ii)$ $CH_2=CBr_2$
$(iii)$ $C_6H_5CH=CH-CH_3$
$(iv)$ $CH_3CH=CClCH_3$

Which of the following compounds shows geometrical isomerism?

The structure of $cis-3-hexene$ is

Which of the following will show geometrical isomerism?

How many geometrical isomers can be written for the compound $CH_3-CH=CH-CH=CH-CH=CH-Cl$?