Identify (X), (Y) and (Z) reagents in the given sequence of reaction.
`CH-=CH overset(X) to CH_(3)CHO overset(Y) to CH_(3)CH(OH)CH_(3) overset(Z) to CH_(3)COCH_(3)`

Options

A. `X=H_(2)SO_(4), Y=H_(2)O//OH^(-), Z=PCl_(5)`, heat
B. `X=HNO_(3), Y=Na_(2)CO_(3),Z=H_(2)SO_(4)`, heat
C. `X=H_(2)SO_(4)//Hg^(2+), Y=PCl_(5)//H_(2)O, Z=K_(2)Cr_(2)O_(7)//OH^(-)`
D. `X=H_(2)SO_(4)//Hg^(2+),Y=CH_(3)MgBr//H_(2)O, Z=K_(2)CrO_(7)//H^(+)`

Answer

To solve the problem of identifying the reagents (X), (Y), and (Z) in the given sequence of reactions, we will analyze each step of the transformation from ethyne (CH≡CH) to the final product (CH₃COCH₃).

### Step 1: Identify Reagent (X)
The first transformation is from ethyne (CH≡CH) to acetaldehyde (CH₃CHO). To convert an alkyne to an aldehyde, we typically use a reaction known as hydroboration-oxidation. The specific reagent used for this transformation is sulfuric acid (H₂SO₄) in the presence of mercury(II) sulfate (HgSO₄).

**Reagent (X):** H₂SO₄ with HgSO₄ (Mercury(II) sulfate)

### Step 2: Identify Reagent (Y)
The next step is the conversion of acetaldehyde (CH₃CHO) to 2-propanol (CH₃CH(OH)CH₃). This transformation is achieved through the use of a Grignard reagent. In this case, we can use methylmagnesium bromide (CH₃MgBr) as the Grignard reagent. The Grignard reagent reacts with the carbonyl group of acetaldehyde to form an alcohol.

**Reagent (Y):** CH₃MgBr (Methylmagnesium bromide)

### Step 3: Identify Reagent (Z)
The final transformation is from 2-propanol (CH₃CH(OH)CH₃) to acetone (CH₃COCH₃). This step involves the oxidation of the alcohol to a ketone. A common oxidizing agent for this transformation is potassium dichromate (K₂Cr₂O₇).

**Reagent (Z):** K₂Cr₂O₇ (Potassium dichromate)

### Summary of Reagents
- **(X):** H₂SO₄ with HgSO₄ (for hydroboration-oxidation)
- **(Y):** CH₃MgBr (Grignard reagent)
- **(Z):** K₂Cr₂O₇ (oxidizing agent)