CUET · CHEMISTRY · PYQ PAPER 2023

Reaction :
Benzene \(\xrightarrow[\text { Anhyd. } AlCl l _{ s } / CuCl ]{ CO _{ Cl } HCl } X\)
\(X\) in above reaction is

A Benzaldehyde (Benzene ring with -CHO)
B Toluene (Benzene ring with - \(CH _3\) )
C Benzene ring \(+ H _2 CO _3\)
D Benzene ring + COCl

Verified Solution

Answer & Solution

Correct Answer

(A) Benzaldehyde (Benzene ring with -CHO)

Step-by-step Solution

Detailed explanation

The reaction is the Gattermann-Koch reaction. X is Benzaldehyde (Benzene ring with -CHO).

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match List-I with List-II

List-I (Term)	List-II (Formula/expression)
(A) Raoult's law	(I) \(\frac{p_1^{\circ}-p_1}{p_1^{\circ}}=x_2\)
(B) Henry's Law	(II) \(p_{\text {total }}=p_1^{\circ}+\left(p_2^{\circ}-p_1^{\circ}\right) x_2\)
(C) Dalton's Law of partial pressure	(III) \(p=K_{H} x\)
(D) Relative lowering of vapor pressure	(IV) \(p_2=p_2^{\circ} x_2\)

choose the correct answer from the options given below:

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Reaction :Benzene \(\xrightarrow[\text { Anhyd. } AlCl l _{ s } / CuCl ]{ CO _{ Cl } HCl } X\)\(X\) in above reaction is

Step-by-step Solution

Reaction :
Benzene \(\xrightarrow[\text { Anhyd. } AlCl l _{ s } / CuCl ]{ CO _{ Cl } HCl } X\)
\(X\) in above reaction is