Why Xe forms compounds with fluorine and oxygen only?

Noble gases are almost inert. Why do they form compounds with fluorine and oxygen only ?

Why do noble gases form compounds with fluorine and oxygen ?

Why does compound (A) given below not form an oxime?

Although electron gain enthalpy of fluorine is less negative as compared to chlorine, fluorine is a stronger oxidising agent than chlorine. Why ?

Explain why inspite of nearly same electronegativity, oxygen forms hydrogen bonding while chlorine does not.