Reduction of which compound gives an optically active alcohol?

Consider the following sequence of reactions:
Ketone $A$ $\xrightarrow[2. H_2O]{1. C_2H_5MgBr} B$ $\xrightarrow[- H_2O]{H_2SO_4, \text{Heat}} C$ $\xrightarrow[2. Zn, H_2O]{1. O_3} \text{Propanone} + \text{Acetaldehyde}$
The ketone $A$ is:

Which among the following compounds is a hemiacetal?

Consider the following sequence of reactions:
Isopropyl benzene $\xrightarrow{O_2} x$ $\xrightarrow[H_2 O]{H^{+}} y + z$
The incorrect statement about $z$ is:

For $C_6H_5CHO$,which of the following is incorrect?

What products are formed on the reaction of $Propanal$ with $2-Methylpropanal$ in the presence of $NaOH$? Write the name of the reaction.