What is the site of crossing over between two chromatids within homologous chromosomes called?

Which one of the following is a normal condition of chromosomes in gametes?

Arrange the following stages of meiosis $I$ in the correct sequence:
$(a)$ Crossing over
$(b)$ Synapsis
$(c)$ Terminalization of chiasmata
$(d)$ Disappearance of nucleolus

At which stage of meiosis does the centromere divide?

The diagram shows a bivalent at prophase-$I$ of meiosis. Which of the four chromatids can cross over?

Match the stages of prophase $I$ given in Column-$I$ with their features in Column-$II$ and choose the correct options from the choices given below:

Column $I$	Column $II$
$A$. Leptotene	$i$. Chromosomes visible under light microscope
$B$. Zygotene	$ii$. Chromosomes start pairing together
$C$. Pachytene	$iii$. Exchange of genetic materials between non-sister chromatids of the homologous chromosomes.
$D$. Diplotene	$iv$. Dissolution of synaptonemal complex
$E$. Diakinesis	$v$. Terminalisation of chiasmata