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:

• A
  $z$ gives yellow precipitate of $CHI_3$ with $NaOH + I_2$ solution
• B
  $z$ gives isopropyl alcohol on reduction with $H_2$ in the presence of $Pd$ catalyst
• C
  $z$ on reaction with $CH_3 MgBr$ followed by hydrolysis gives $2^{\circ}$ alcohol
• D
  $z$ does not give positive test with Fehling's reagent