Indicate the sigma and pi bond in the following molecules : C6H6

Answer

C

Explanation

`(1)/(2)N_(2)(g)+(3)/(2)H_(2)(g)rarrNH_(3)(g)`
Let B.E. of `N-=N` is x
`-46 = (x)/(2)+(3)/(2)xx436 - 3xx393 implies x = 958`
`N_(2)H_(4)(l)
rarrN_(2)(g)+2H_(2)(g),`
`Delta_(r )H=-50 " kJ"//"mol"`
`Delta_(r)H=[(Delta_("vap")H(N_(2)H_(4),l)),(+4xxB.E.(N-H)),(+B.E.(N-N))]`
`-((B.E.(N-=N)),(+2B.E.(H-H)))`
`-50 =(18+4xx393+y)-(958 + 2xx436)`
`-50=(1590+y)-(1830)`
`B.E. (N-N) or y = 190 kJ/mol