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

Which of the following will not give the iodoform test?

Which of the following statements is $INCORRECT$?

In the given reaction sequence,identify the structure of $(B)$:
Cyclohexanol $\xrightarrow{PCC}$ $(A)$ $\xrightarrow{H-CHO, \text{dil. } KOH, \Delta}$ $(B)$

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:

In the Claisen$-$Schmidt reaction to prepare dibenzalacetone from $5.3 \ g$ benzaldehyde,a total of $3.51 \ g$ of product was obtained. The percentage yield in this reaction was $......... \%.$