Both ethanal and propanone will react with which of the following?

Which of the following compounds would not give tert-butyl alcohol when treated with excess methylmagnesium bromide $(CH_3MgBr)$ followed by acid?

Compound $(C)$ is

In a set of the given reactions,acetic acid yielded a product $C$. Product $C$ would be:
$CH_3COOH + PCl_5 \to A$ $\xrightarrow{C_6H_6, \text{anh. } AlCl_3} B$ $\xrightarrow{C_2H_5MgBr, \text{ether}} C$

Consider the following sequence of reactions:
$2-\text{benzylbenzoic acid}$ $\xrightarrow[2. \text{anhyd. } AlCl_3]{1. SOCl_2} A$ $\xrightarrow{Zn-Hg, \text{Conc. } HCl} B$
The end product $(B)$ is:

Clemmensen reduction of a ketone is carried out in the presence of