Q.

Which has greater reactivity

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a

TeCl6

b

SF6

c

TeF6

d

SeF6

answer is C.

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Detailed Solution

TeCl6 is unknow because Te atom cannot accommodate six large Cl atoms around itself. SF6 is extremely unreactive, because it is coordinately saturated and sterically hindered. SeF6 is slightly less reactive then TeF6 which is hydrolysed by water.TeF6+6H2O→6HF+H6TeO6
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