The correct order of reactivity of hydrogen halides with ethyl alcohol is

Order of reactivity of hydrogen halides towards ethers is

The correct order of reactivity of the halides ethyl chloride (I) iso-propyl chloride (II) and benzyl chloride (III) in S_(N^(1)) reaction is :

The correct order of boiling points of hydrogen halide is:

The correct order of the thermal stability of hydrogen halide is