Which one of the following compounds will give an orange precipitate when treated with $2,4-$dinitrophenylhydrazine?

Product $(D)$ in the above sequence is:

$A$ compound $A$ has the molecular formula $C_2Cl_3OH$. It reduces Fehling's solution and on oxidation,it gives a monocarboxylic acid $B$. Compound $A$ is also obtained by the reaction of ethanol with chlorine. What is $A$?

$CH_3-CO-CH_2-CH_2-CH_2-CH_2-CHO \xrightarrow{KOH} ?$ The number of intramolecular aldol condensation products is:

Which of the following compounds is the least reactive towards nucleophilic addition reactions?

Match the reactions given in column-$I$ with the suitable reagents given in column-$II$.

Column-$I$ (Reactions)	Column-$II$ (Reagents)
$(i)$. Benzophenone $\rightarrow$ Diphenylmethane	$(a)$. $LiAlH_4$
$(ii)$. Benzaldehyde $\rightarrow$ $1-$Phenylethanol	$(b)$. $DIBAL-H$
$(iii)$. Cyclohexanone $\rightarrow$ Cyclohexanol	$(c)$. $Zn(Hg) / \text{Conc. } HCl$
$(iv)$. Phenyl benzoate $\rightarrow$ Benzaldehyde	$(d)$. $CH_3MgBr, H_2O$