UP Board Class 12 Chemistry Question Paper 2026 PDF with Solutions

Question 1:

If the rate law of a reaction is Rate \(= K[A]^2 [B]^0\), then what will be the order of the reaction?

• (i) Zero order

For which of the following ions will the magnetic moment (\(\mu\)) be maximum?

• (i) \(Zn^{2+}\)

The increasing order of reactivity of the following compounds in \(S_N1\) reaction is:

Compounds:

A. \((CH_3)_3CBr\)

B. \(CH_3CH_2CH_2CH_2Br\)

C. \((CH_3)_2CHCH_2Br\)

D. \(CH_3CH(Br)CH_2CH_3\)

• (i) \(A < B < C < D\)
• (ii) B < C < D < A
  (iii) D < C < B < A
  (iv) B < D < A < C

Does the half-life of a first-order reaction depend on the initial concentration of the reaction? Explain.

Write the definition of electrode potential and cell electromotive force (emf).

\([NiCl_4]^{2-}\) is paramagnetic while \([Ni(CO)_4]\) is diamagnetic even though both are tetrahedral. Why?

Write the IUPAC nomenclature of the following organic compounds:

(i) \(CH_3 - CH_2 - \overset{O}{\overset{||}{C}} - CH_2 - \underset{CH_3}{\underset{|}{CH}} - CH_3\)

(ii) \(Ph - CH = CH - CHO\)

Write the mechanism of bimolecular nucleophilic substitution reaction (\(S_N2\)) of alkyl halide.

What is a peptide bond? Explain with an example.

(i) Write the electronic configuration of the element with atomic number 24.

(ii) Find the number of unpaired electrons in \(Co^{2+}\) ion.

(iii) Why is the range of oxidation states greater in the actinoid series compared to the lanthanoid series?

What happens when aniline reacts with the following:

(i) Bromine water

(ii) \((CH_3CO)_2O\) / Pyridine

(iii) \(HNO_2 + HCl (0^\circ - 5^\circ C)\)

Write the structures of (A), (B), and (C) in the following reaction:

Reaction Scheme: \[ (C) \xleftarrow{conc. HNO_3} Phenol \xrightarrow{dil. HNO_3} (A) + (B) \]

Write the structures of (A), (B), and (C) in the following reaction:
\[ C_6H_5NO_2 \xrightarrow{Fe/HCl} (A) \xrightarrow[273 K]{NaNO_2 + HCl} (B) \xrightarrow[\Delta]{H_2O/H^+} (C) \]