what is the mechanism behind reduction of alcohol aldehyde ketone by red phosphorus and HI?

i am not able to understand why we are gtting single alkane as product in most of reactions but v get two alkane when we use R-COOR’ as reactant?

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'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane