N-N single bond enthalpy is 'X'  N=N double bond enthalpy is 'Y' correct relation is

N∙∙-N∙∙sigma bond is very weak due to the repulsions between the adjacent nitrogen atoms  âˆ´ 'X' has very low magnitudeA double bond contains one sigma (strong) and a Pi-bond(weak)So  Sum of enthalpies of two sigma bonds > Enthalpy of a Double bondBut in the case of NitrogenSum of enthalpies of two sigma bonds (2X)< Enthalpy of a Double bond(Y)                2X < Y