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

sigma bond is very weak due to the repulsions between the adjacent Oxygen atoms  '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 OxygenSum of enthalpies of two sigma bonds (2X)< Enthalpy of a Double bond(Y)                2X < Y