recently i play at wsop colossus event, i had problem with this hand

i got QQ squeeze at SB with 100bb on level 1(25/50). the young player(this guy can make a 2 barrel with nothing before ) raise from mp and call my squeeze.
flop come 456r(2 player), i bet 500, he raise 1250 , i go all in 5000 .(i put him on 77 to JJ,67)

my question is 1) will the guy willing to go bust on first level with small pair?
2) will you play this hand the same way at any level?
3) will you guy fold this hand?
4) if villian just call on flop, will you guy just bet flop , bet turn, and check river because don't want to go broke on my hand?