Cyclopentanol on reaction with $NaH$ followed by $CS_{2}$ and $CH_{3}I$ produces a/an

$A$ reaction between $CH_3MgBr$ (methyl magnesium bromide) and $C_2H_5OH$ (ethyl alcohol) gives:

An unknown compound $D$ is first oxidized to an aldehyde and then to acetic acid by a dilute solution of $K_2Cr_2O_7$ and $H_2SO_4$. The unknown compound $D$ is:

$Ph-CH=CH-CH_3$ $\xrightarrow[H_2O_2/OH^-]{B_2H_6/THF}$ Products. Reaction $(A)$
$CH_3-CH=CH-Ph$ $\xrightarrow[NaBH_4]{Hg(OAc)_2/H_2O}$ Products. Reaction $(B)$
Which statement is correct?

An alcohol $X$ $(C_4H_{10}O)$ does not give turbidity with conc. $HCl$ and $ZnCl_2$ at room temperature. $X$ on reaction with reagent $Y$ gives $Z$. What are $X, Y$ and $Z$ respectively?

Which of the following on oxidation forms $propanone$?