1.

order of reactivity of C_2H_6, C_2H_4 and C_2H_2 is

Answer»

`C_2H_6 GT C_2H_4 gt C_2H_2`
`C_2H_2 gt C_2H_6 gt C_2H_4`
`C_2 H_2 gt C_2H_4 gt C_2H_6`
All are equally reactive

Solution :Unsaturated hydrocarbons are more reactive than saturated hydrocarbons . Among ethyne `(C_2H_2)` and ETHENE `(C_2H_4)` , the later is more reactive as `C-=C` triple BOND is quite STRONG bond and therefore ethyne generally require catalysts (LIKE `Hg^(2+)` etc ) in its reactions


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