Which of the following reagents can form a hydrazone with alkanone?

Write a test to differentiate between pentan$-2-$one and pentan$-3-$one.

The test to differentiate between $\text{pentan-2-one}$ and $\text{pentan-3-one}$ is

An organic compound $x$ where the molar ratio of $C$, $O$, and $H$ are equal, on treatment with $50\% \ KOH$ under reflux followed by acidification produced $y$. The most likely structure of $y$ is: [Molar mass of $x$ is $58 \ g \ mol^{-1}$]

Explain the aldol condensation reaction.

Which of the following compounds will not undergo an aldol condensation reaction?