Folah78
You CANNOT CONCLUDE that Jesus was referring to 2Ch.24:21 simply because that's the only Zechariah's murder recorded in the tanach.
According to Matt.23:35 Zechariah ben Berechiah was murdered between the Sanctuary and the altar.
According to 2Ch.24:21 Zechariah ben Yehoiada was STONED to death in the forecourt of the House of the Lord.
The similarity in both cases (other than their names) is that they were both murdered in the temple. Since you don't know how Zechariah ben Berechiah died you simply can't conclude Jesus was talking about 2Chr.24:21.

Malachi's response: And around and around the merry go round goes. This clearly shows that the author did not have an accurate knowledge of the Hebrew Bible. The GT makes numerous mistakes and so do the Christians who say that Jesus is G-d that knows the future. He does not know the future and he never claimed to be G-d who knows all.

Best regards,
Malachi