Which of the following organic compounds will give a colored crystalline product with the compound shown in the image?

Which of the following products is obtained by the oxidation of propionaldehyde?

Which of the following statements is $NOT$ false for benzaldehyde?

Consider the following sequence of reactions. The incorrect statement about $R$ is:

Which is not true about acetophenone?

Which of the following compounds would undergo aldol condensation,which the Cannizzaro reaction and which neither? Write the structures of the expected products of aldol condensation and Cannizzaro reaction.
$(i)$ Methanal $(ii)$ $2-$Methylpentanal $(iii)$ Benzaldehyde $(iv)$ Benzophenone $(v)$ Cyclohexanone $(vi)$ $1-$Phenylpropanone $(vii)$ Phenylacetaldehyde $(viii)$ Butan$-1-$ol $(ix)$ $2,2-$Dimethylbutanal