CUET · CHEMISTRY · PYQ PAPER 2024

In the reaction \(\left( CH _3\right)_3 C - O - CH _3+ HI \rightarrow\) Products, \(CH _3 OH\) and \(\left( CH _3\right)_3 CCl\) are the products and not \(CH _3 I\) and \(\left( CH _3\right)_3 COH\). It is because:
(A) In step 2 of the reaction, the departure of leaving group ( \(HO - CH _3\) ) creates less stable carbocation.
(B) In step 2 of the reaction, the departure of leaving group ( \(HO - CH _3\) ) creates more stable carbocation.
(C) The reaction follows an SN1 mechanism.
(D) The reaction follows SN2 mechanism.
Choose the correct answer from the options given below :

A (A) and (B) only
B (B) and (C) only
C (A) and (D) only
D (A) and(C) only

Verified Solution

Answer & Solution

Correct Answer

(A) (A) and (B) only

Step-by-step Solution

Detailed explanation

(B) correctly identifies that the departure of the leaving group leads to a more stable carbocation (tertiary). (C) refers to the SN1 mechanism, which is consistent with the formation of a tertiary carbocation and the nature of the reaction.

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.

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From CUET

Match List I with List II

LIST I	LIST II
A. \(\left[ Co \left( H _2 NCH _2 CH _2 NH _2\right)_3\right]_2\left( SO _4\right)_3\)	I. Tetracarbonylnickel(0)
B. \([\text{Ni}(\text{CO})_4]\)	II. Mercury tetrathiocyanatocobaltate(III)
C. \([\text{CoCl}_2(\text{en})_2]^+\)	III. tris(ethane-1,2-diamine)cobalt(III) sulphate
D. \(\text{Hg}[\text{Co}(\text{SCN})_4]\)	IV. Dichloridobis(ethane-1,2-diammine)cobalt(III)

Choose the correct answer from the options given below:

CUET 2023 Hard

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List - I (Name of compound)	List - II (Structure)
(A). Resorcinol	(I)
(B). Catechol	(II)
(C). Hydroquinone	(III)
(D). p-Cresol	(IV)