Acetaldehyde and acetone can be distinguished by

Which one of the following undergoes reaction with $50\% \, NaOH$ solution to give the corresponding alcohol and acid?

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

In the given reaction,the number of chiral carbon$(s)$ in product $A$ is .......
(Where $Et$ is $-C_2H_5$)

Acetaldehyde $(CH_3CHO)$ reacts with:

Geminal diols (compounds with two $-OH$ groups on the same carbon atom) are generally unstable. However,which of the following is stable?