In the Cannizzaro reaction given below,the slowest step is $:-$
$2Ph-CHO \xrightarrow{\stackrel{\ominus}{O}H} PhCH_2OH + PhCO_2^{\ominus}$

Contents of three bottles were found to react as follows:
$(i)$ Neither with Fehling's solution nor with Tollen's reagent
$(ii)$ Only with Tollen's reagent but not with Fehling's solution
$(iii)$ With both Tollen's reagent and Fehling's solution.
If they contained either ethanal,propanone,or benzaldehyde,which bottle contained which?

Compound "x" having molecular formula $C_3H_6O$,is reduced by Red $P/HI$ to give compound "y" $(C_3H_8)$. If "x" reduces Tollen's reagent,what is the possible structure of "x"?

Product $(D)$ will be

Predict the major product of the following reaction sequence:

The product of which of the following reactions forms a reddish brown precipitate when subjected to Fehling's test?