The correct observation in the following reactions is :

The major product of the following reaction is :

The shape / structure of [XeF₅]^– and XeO₃F₂, respectively, are

An organic compound ‘A’ (C₉H₁₀O) when treated with conc. HI undergoes cleavage to yield compounds ‘B’ and ‘C’. ‘B’ gives yellow precipitate with AgNO₃ where as ‘C’ tautomerizes to ‘D’. ‘D’ gives positive iodoform test. ‘A’ could be