An organic compound (A) contaning C, H, and O `(16.32%)` does not decolourise bromine water and does not give any precipitate with ammonical `AgNO_(3)`. It consumes 1 mol of `NH_(2)OH` per mole of (A) to give a solid derivative. The monobromo derivative of (A) shows optical activity. If (A) is optically inactive, suggest the structure.

Explanation

(A) can be ketone of the type `R-overset(O)overset(||)C-R'`. Percentage of `O = 16.32`
Let `R+R''=x`, Mw of ketone `=x+12+16=x+28 (x+28)` gm of ketone contains `implies (16)/(x+28)xx100` gm of O
`implies (16xx100)/((x+28))=16.32(:. x=70)`
`C_(n)H_(2n+1)=70 implies 12n+2n+1=70`
`n=(69)/(14)~~4.9`
R and R' cannot be straight chain. There is possibility of ring structure with `(-CO-)` group. So (A) can be: