If formaldehyde and $KOH$ are heated,then we get

Reduction of an aldehyde produces

For the given reaction,find the sum of $x + y = ?$
$CH_3-CH_2-CO-CH_3 \xrightarrow[(ii) \ y \ mol \ NaNH_2]{(i) \ x \ mol \ PCl_5} CH_3-C \equiv C-CH_3$

Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound $E$. Compound $E$ on further treatment with aqueous $KOH$ yields compound $F$. Compound $F$ is

Benzaldehyde condenses with $N,N$-dimethylaniline in the presence of anhydrous $ZnCl_2$ to give:

Write about $(a)$ Tollen's Test and $(b)$ Fehling solution. $OR$ Write the oxidation reaction of only aldehyde. $OR$ Write tests which are utilized to differentiate aldehydes and ketones.