Aldehydes can be oxidised by

Which reagent gives an orange-coloured precipitate with acetaldehyde?

Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam $(Zn(Hg))$ and concentrated $HCl$ is called:

The reactant is $3$-methylpentanal. The reaction with $NaCN$ followed by $H_2SO_4$ (cyanohydrin formation) is shown below:
$CH_3CH_2CH(CH_3)CH_2CHO \xrightarrow{NaCN/H^+} CH_3CH_2CH(CH_3)CH_2CH(OH)CN$
Products of the reaction are:

What is the product obtained when $m$-chlorobenzaldehyde is treated with a $50\% KOH$ solution?

Which one of the following will be most readily dehydrated in acidic condition?