MCQ
The correct $IUPAC$ name of the compound is


- A$1 -$ Ethenylcyclohexa $-2, 4 -$ diene
- ✓$5 -$ Ethenylcyclohexa $-1, 3 -$ diene
- C$6 -$ Ethenylcyclohexa $-1, 3 -$ diene
- DCyclohexa $-2, 4 -$ dienylethene

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$(I)$ When $X$ dimerises bond angle decreases
$(II)$ When $X$ dimerises bond angle increases
$(III)$ In $X-Y$ molecule $C-C$ bond length is less than that in $Y-Y$ molecule
$(IV)$ Bond angle in $X$ is greater than that in $Y$