1)
What is the significance that it was on the fifth of the [fourth] month?
1.
Malbim: That is when the fifth year of Galus Yehoyachin began, for he was exiled on the fifth of Tamuz.
2)
What is the significance that it was in the fifth year of Galus Yehoyachin?
1.
Radak (1): The evil began in the days of Yoshiyah; Hashem showed the Navi that it will finish. The fifth year of Galus Yehoyachin is when Tzidkiyah came to Bavel, in the fourth year of his reign.
3)
Why does it say "Yoyachin"?
1.
Radak: This is like Yehoyachin. We find also Yonadav in place of Yehonadav, and Yonason in place of Yehonason.
