CUET · CHEMISTRY · PYQ PAPER 2025

Which is the correct IUPAC name of the compound \(CH _3 CH = CHC ( Br )\left( CH _3\right)_2 ?\)

A 4-Bromo-4-methylpent-2-ene
B 2-Bromo-2-methylpent-2-ene
C 4-Bromo-2-methylpent-2-ene
D 2-Bromo-4-methylpent-2-ene

Verified Solution

Answer & Solution

Correct Answer

(A) 4-Bromo-4-methylpent-2-ene

Step-by-step Solution

Detailed explanation

Longest chain with double bond: 5 carbons (pentene). Numbering for lowest double bond locant: From left, double bond at C2. Substituents: Bromine at C4, Methyl at C4. IUPAC name: 4-Bromo-4-methylpent-2-ene.

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 the complex given in List - I with the number of unpaired electrons given in List - II

List-I (Complex)	List-II (Number of unpaired electrons (n))
(A) \(\left[ NiCl _4\right]^{2-}\)	(I) 5
(B) \(\left[ Co \left( NH _3\right)_6\right]^{3 +}\)	(II) 1
(C) \(\left[ FeF _6\right]^{3-}\)	(III) 2
(D) \(\left[ Fe ( CN )_6\right]^{3-}\)	(IV) \(0\)

Choose the correct answer from the options given below:

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