the correct sequence of events in Prophase I is:

1. Leptotene: Compaction/condensation of chromosomal material (a) .
2. Zygotene: Pairing of homologous chromosomes called synapsis (c) .
3. Pachytene: Crossing over occurs between non-sister chromatids (d) .
4. Diplotene: Dissolution of the synaptonemal complex (e) .
5. Diakinesis: Terminalisation of chiasmata (b) , . Therefore, the correct sequence is (a) $\rightarrow$ (c) $\rightarrow$ (d) $\rightarrow$ (e) $\rightarrow$ (b).