COMEDK 2025 Evening Shift | Hydrocarbons Question 7 | Chemistry

Identify the Carbonyl compound which will not be formed when hydration of Alkynes is carried out with dil. $\mathrm{H}_2 \mathrm{SO}_4 / \mathrm{Hg}^{2+}$ at 333 K .

Acetone, Butanal, Ethanal, Butanone.

Acetone

Butanone

Butanal

Ethanal

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

An Alkene " X " on reaction with hot acidified $\mathrm{KMnO}_4$ gave a mixture of Ethanoic acid and Propanone. Identify " X ".

Pent-2-ene

2-Methylbut-2-ene.

But-2-ene

2,3 -Dimethylbut-2-ene

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

Match the reactions in Column I with the correct products given in Column II

S.No.	Column I	S.NO.	Column II
A.	1- Chloropropane $+(\mathrm{Zn} / \mathrm{HCl}) \rightarrow$	P.	Propanone + Methanal
B.	n- Hexane $+\left(\right.$ anh. $\left.\mathrm{AlCl}_3 / \mathrm{HCl}_{(\mathrm{g})}\right) \rightarrow$	Q.	Propanone
C.	2- Methylpropene $+\left(\mathrm{O}_3 \& \mathrm{Zn} / \mathrm{H}_2 \mathrm{O}\right) \rightarrow$	R.	Propane
D.	Propyne $+\left(\mathrm{HgSO}_4 / \mathrm{H}_2 \mathrm{SO}_4\right.$ at 333 K$) \rightarrow$	S.	2-Methylpentane + 3-Methylpentane

$A-R \quad B-S \quad C-P \quad D-Q$

$A-S \quad B-R \quad C-Q \quad D-P$

$A-P \quad B-S \quad C-R \quad D-Q$

$A-Q \quad B-P \quad C-S \quad D-R$

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

When one mole of a hydrocarbon $\mathbf{C}_{\mathbf{a}} \mathbf{H}_{\mathbf{b}}$ undergoes complete combustion, it requires 7.5 moles of $\mathrm{O}_2$ and results in the production of 6 moles of $\mathrm{CO}_2$. Calculate the values of $\mathbf{a}$ and $\mathbf{b}$.

$a=4$ and $b=10$

$a=6$ and $b=6$

$a=6$ and $b=12$

$a=4$ and $b=8$

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