List of top Chemistry Questions asked in UP Board XII

How will you synthesize the following? Give chemical equations only.
(i) 1-phenylethanol from a suitable alkene (ii) Cyclohexylmethanol with the help of alkyl halide by \( S_N2 \) reaction. (iii) Pentan-1-ol from a suitable alkyl halide.
Potassium cyanide gives alkyl cyanide on reaction with haloalkanes (R-X) while silver cyanide forms an isocyanide as main product.
Write the oxidation states, distribution of d-orbitals and coordination number of central metal of following complexes:
Write important structural and functional differences between DNA and RNA.
Haloalkanes give nucleophilic substitution reactions while haloarenes give electrophilic substitution reactions.
Write structural formula and IUPAC name of the following:
(i) sec-butyl chloride
(ii) isopentyl bromide
(iii) tert-butyl chloride
(iv) isobutyl chloride
(v) neopentyl chloride
Write IUPAC name of the following complexes: (x) \([Co(NH_3)_5Cl]Cl_2\) , (y) \(K_2[Ni(CN)_4]\)
Differentiate between:
(x) Order of a reaction and molecularity
(y) Average and instantaneous velocity
Explain Kohlrausch Law. Limiting molar conductances (\( \lambda^0 \)) of \( \text{Ca}^{2+} \) and \( \text{Cl}^- \) ions in water at 298 K are 119.0 S cm\(^2\) mol\(^{-1}\) and 76.3 S cm\(^2\) mol\(^{-1}\) respectively. Calculate \( \lambda^0_m \) of \( \text{CaCl}_2 \).
Why do the conductivity of a solution decreases with dilution? Explain with reason.
Transition metals generally form coloured compounds.
Why metals show their maximum oxidation states in oxides and fluorides?
Differentiate between the following:
(i) Propanal and Propanone,
(ii) Phenol and Benzoic acid.
The resistance of a column formed by a 0.10 mol L^{-1} concentrated solution is 6.5 × 10^3 ohm. Its diameter is 1 cm and length is 50 cm. Calculate its resistivity, conductivity and molar conductivity.
Alcohols are more soluble in water in comparison to hydrocarbons of comparable molecular weight. Explain.
Explain the following reactions with suitable chemical equations:
(i) Wurtz reaction
(ii) Wurtz-Fittig reaction
Show the geometrical isomers of \([Fe(NH_3)_2(CN)_4]\).
Calculate molality of a solution of 5.0 g of ethanoic acid (CH}_3\textbf{COOH) in 150.0 g of benzene.
Reagent, which do not react with acetone and benzaldehyde:
How many ions will be generated from the solution of the complex \( [Co(NH_3)_6]Cl_2 \)?
Give an example of such solid solution in which solute is gas.
Write short notes on the following: Coupling reaction:
Write notes on the following: Mechanism of esterification of carboxylic acid:
Write the chemical equation for the preparation of acetaldehyde and write a note on Aldol condensation and cross-Aldol condensation.
Write the chemical equation for the preparation of Aniline and write the chemical equation of its reaction with the following: