Question

How many mole of electrons are required to reduce 1.5 mole of nitro benzene into aniline,if current efficiency,in this experiment is 50%

Answer 1

18 electrons.

1.5N(+3) + 9e -> 1.5N(-3)
current efficiency is 50% (0.5), so we need 9/0.5 = 18 electrons.