1-Penten-4-yne reacts with 1 mol bromine at -`80°C` to produce :

1-penten-3-one

Bromine react with NaOH to produce

Bromine react with NaOH to produce

3-penten-1-ol

XeF_4 reacts with water at -80^@C to give

The amount (in mol) of bromoform (CHBr_(3)) produced when 1.0 mol of acetone reacts completely with 1.0 mol of bromine in the presence of aqueous NaOH is