$1, 2-Dichloroethene$ shows:

Identify the type of isomerism exhibited by the following structures:
$H_3C-CH=CH-CH_3$ (cis-but$-2-$ene) and $H_3C-CH=CH-CH_3$ (trans-but$-2-$ene).

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

In the given reaction: $C_6H_5-CH=O \xrightarrow{NH_2OH/H^{+}} [X]$. $[X]$ will be:

Which of the following compounds shows geometrical isomerism?

Geometrical isomers differ in