Which of the following does $NOT$ exhibit haloform reaction?

Compounds $P$ and $R$ upon ozonolysis produce $Q$ and $S$,respectively. The molecular formula of $Q$ and $S$ is $C_8H_8O$. $Q$ undergoes Cannizzaro reaction but not haloform reaction,whereas $S$ undergoes haloform reaction but not Cannizzaro reaction.
$(i)$ $P \xrightarrow[\text{ii) } Zn / H_2O]{\text{i) } O_3 / CH_2Cl_2} \underset{(C_8H_8O)}{Q}$
$(ii)$ $R \xrightarrow[\text{ii) } Zn / H_2O]{\text{i) } O_3 / CH_2Cl_2} \underset{(C_8H_8O)}{S}$
The option$(s)$ with a suitable combination of $P$ and $R$,respectively,is(are):

Addition of alcohols to aldehydes in the presence of anhydrous acids yields:

Which one of the following on oxidation will not give a carboxylic acid with the same number of carbon atoms?

Provide the conversion for the following:
$(i)$ Formaldehyde to Butan$-1-$ol
$(ii)$ $1-$Bromopropan$-2-$one from Isopropyl alcohol

Which of the following substances will not react with Fehling's solution?