CUET · CHEMISTRY · PYQ PAPER 2023

Which of the following reactions are correct?
A. \(R - NO _2 \xrightarrow{ KMnO _4 / KOH } RNH _2\)
B. \(R - NO _2 \xrightarrow{ Sn / HCl } RNH _2\)
C. \(RCN \xrightarrow{ H _2 O / H ^{+}} RCH _2 NH _2\)
D. \(RCN \xrightarrow{ H _2 / Pd } RCH _2 NH _2\)
E. \(RCONH _2 \xrightarrow{\text { (i) } LAIH _4}{ }_4\) (ii) \(H _2 O RCH _2 NH _2\)
Choose the correct answer from the options given below:

A A, E, C only
B B, D, E only
C A, B, C only
D C, D, E only

Verified Solution

Answer & Solution

Correct Answer

(D) C, D, E only

Step-by-step Solution

Detailed explanation

B. \(R - NO _2 \xrightarrow{ Sn / HCl } RNH _2\) D. \(RCN \xrightarrow{ H _2 / Pd } RCH _2 NH _2\) E. \(RCONH _2 \xrightarrow{\text { (i) } LAIH _4}{\text { (ii) } H _2 O } RCH _2 NH _2\)

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	List - II
A. Simple and face centred cubic	I. \(\text{a} = \text{b} = \text{c}\)
B. Cubic and rhombohedral	II. \(\alpha = \beta = \gamma = 90°\)
C. Cubic and tetragonal	III. have only two crystallographic angle of \(90°\)
D. Hexagonal and monoclinic	IV. belong to the same crystalline system

Choose the correct answer from the options given below :

CUET 2023 Hard

Explore more questions on app

From CUET

Explore more questions on app

X	-4	-3	-2	-1	0
p(x)	0.1	0.2	0.3	0.2	0.2

X	1	2	3	4	5	6	7
\(P(X)\)	C	2C	2C	3C	\(C^2\)	\(2 C^2\)	\(7 C^2+C\)