organic doubts

In 4th one there should be another bromine atom on the other carbon of the double bond, and zinc will abstract both to form a triple bond.

In 3rd,

Pehle waale ka ans toh tune hi de diya..

listen in 1 iwant to ask whethet it will reduce both the double bond or one as mole of H₂ is not specified

and in 2 whether redP and HI will reduce all the functional groups .then what is the answer

in 4 one as the reduction of alkyl hallides takes place for saturated hallides.how this will occur