Which of the following compounds will not react with phenylhydrazine?

In the following reaction:
$\text{Carbonyl compound} + MeOH \xleftarrow[HCl]{} \text{acetal}$
The rate of the reaction is the highest for:

Which of the following is not true about acetophenone?

What are $X$ and $Y$ respectively in the following reaction sequence?

Ketone reacts with $NH_2OH$ to give oxime. The reaction is as follows:
$R_2C=O + H_2N-OH \rightarrow R_2C=N-OH + H_2O$
The total number of organic products (ketoxime) formed when the simplest ketone and its next higher homologue react with $NH_2OH$,is:

Correct order for nucleophilic addition reaction :
$(1)$ $C_{6}H_{5}COC_{6}H_{5}$
$(2)$ $C_{6}H_{5}CHO$
$(3)$ $p-CH_{3}C_{6}H_{4}CHO$
$(4)$ $p-CH_{3}OC_{6}H_{4}CHO$