The prefixes $syn$ and $anti$ are used to denote $.....$.

Which of the following exhibits geometrical isomerism?

Which of the following compounds does not have any geometrical isomer?

The incorrect statements regarding geometrical isomerism are :
$(A)$ Propene shows geometrical isomerism.
$(B)$ Trans isomer has identical atoms/groups on the opposite sides of the double bond.
$(C)$ Cis$-$but$-2-$ene has higher dipole moment than trans$-$but$-2-$ene.
$(D)$ $2-$methylbut$-2-$ene shows two geometrical isomers.
$(E)$ Trans$-$isomer has lower melting point than cis isomer.
Choose the $CORRECT$ answer from the options given below :

Between $cis$ and $trans$ isomers,which has a higher dipole moment? Explain with an example.

What is the number of carbon atoms present in the smallest acyclic hydrocarbon capable of exhibiting cis-trans isomerism?