CUET · CHEMISTRY · PYQ PAPER 2023

Certain Aldehydes, Retore and certain alcohol undergo iodoform test. Certain Aldehydes ketones undergo aldol condensation. While certain aldehydes undergo Cannizaro's reaction. Aldehydes responds to tollen reagent and fehling reagent test.
Which amongst the following undergo iodoform test?
A. \(CH_3OH\)
B. \(CH_3CH_2OH\)
C. \(CH_3CH(OH)CH_3\)
D. \(CH_3CH_2CH_2OH\)
Choose the correct option

A A and D only
B B and C only
C B and D only
D A and B only

Verified Solution

Answer & Solution

Correct Answer

(B) B and C only

Step-by-step Solution

Detailed explanation

Compounds with \(CH_3CH(OH)-\) or \(CH_3CO-\) groups undergo iodoform test. B. \(CH_3CH_2OH\) (Ethanol) has a \(CH_3CH(OH)-\) equivalent (upon oxidation forms \(CH_3CHO\)). C. \(CH_3CH(OH)CH_3\) (Propan-2-ol) has a \(CH_3CH(OH)-\) group. B and C only

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 (Reaction property)	List-II (Formula)
(A) Half-life of decomposition of gaseous ammonia on hot platinum surface	(I) \(\frac{1}{t} \ln \left(\frac{[A]_0}{[A]_t}\right)\)
(B) Instantaneous rate	(II) \(\frac{[R]_0}{2 k}\)
(C) Rate constant of inversion of cane sugar	(III) \(-\frac{d x}{d t}\)
(D) Half-life of acid hydrolysis of methyl acetate	(IV) \(\frac{\ln (2)}{k}\)

Choose the correct answer from the options given below:

CUET 2025 Easy

Which of the following pair of compounds exhibits the same color in aqueous solution?

CUET 2024 Hard

Explore more questions on app

From CUET

Identify X in the following nuclear reaction:
\( {}_{6}^{12}C + {}_{1}^{1}H \rightarrow X \)

CUET 2023 Easy

Match List I with List II

List I (Acronym)	List ll (Description)
(A) ZIFT	(I) Transfer of an ovum from a donor into the fallopian tube of another female.
(B) GIFT	(II) Semen collection from husband/healthy donor is artificially introduced into the uterus of the female.
(C) IUT	(III) Transfer of zygote or embryo of upto 8 blastomeres into fallopian tube.
(D) IUI	(IV) Transfer of embryo with more than 8 blastomeres into uterus.

Choose the correct answer from the options given below:

CUET 2023 Easy

Match List-I with List-II

List-I (Motion of a charge particle)	List-II (Path)
(A) Initial velocity of charge particle parallel to B	(I) Circular Path
(B) Initial velocity of charge particle perpendicular to B	(II) Helical Path
(C) Initial velocity of charge particle inclined to B	(III) Straight Path
(D) Initial velocity of charge particle perpendicular to E	(IV) Parabolic Path

Choose the correct answer from the options given below :

CUET 2025 Easy

Explore more questions on app