Which of the following organic compounds exhibits positive Fehling test as well as iodoform test?

The increasing order of the following compounds towards $HCN$ addition is:

Comment on the optical activity of the products. They are:

$CH_3-COOH \xrightarrow[(2)\Delta ]{(1)Ca(OH)_2} P$. Compound $P$ can show:

Explain the preparation of hydrocarbon compounds by the Clemmensen reduction reaction.

Match List-$I$ with List-$II$.
List-$I$ (Reaction):
$A$. Bicyclohexylidene $\rightarrow$ $2$ Cyclohexanone
$B$. Benzene $\rightarrow$ Benzophenone
$C$. Cyclohexanol $\rightarrow$ Cyclohexanone
$D$. Ethylbenzene $\rightarrow$ Potassium benzoate
List-$II$ (Reagents/Condition):
$I$. Benzoyl chloride / Anhydrous $AlCl_3$
$II$. $CrO_3$
$III$. $KMnO_4 / KOH, \Delta$
$IV$. $(i) O_3, (ii) Zn-H_2O$
Choose the correct answer from the options given below: