List of top Chemistry Questions asked in UP Board XII

What do you understand by order of a reaction? Calculate the total order of those reactions which have velocity equations:
(i) Velocity \( = K[A]^{1/2}[B]^{3/2} \)
(ii) Velocity \( = K[A]^3[B]^{-1} \)
Write the products of the following reactions:
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Hydrogen atom of chloroform is acidic in nature.
Explain Raoult's Law. The vapour pressure of chloroform (\( \text{CHCl}_3 \)) and dichloromethane (\( \text{CH}_2\text{Cl}_2 \)) are 200 mm Hg and 4.5 mm Hg respectively at 298 K. Calculate the vapour pressure of the solution formed by mixing 51 g of \( \text{CHCl}_3 \) and 20 g of \( \text{CH}_2\text{Cl}_2 \) at 298 K.
Why is there always a decreasing tendency of solubility of gases in liquid on rising temperature?
Write short notes on the following:
(i) Carbylamine reaction
(ii) Hofmann–bromamide reaction
(iii) Diazotisation
Write structures of the following compounds: (i) 2-Chloro-3-methylpentane
(ii) 1,4-dibromobut-2-ene
(iii) 1-Bromo-2,2-dimethylpropane
(iv) 1-Bromo-2-methylbut-2-ene
(v) 1-Chloro-2-methylbenzene
What do you understand by these following terms? Give one example of each.
(i) Aldol (ii) Schiff's base (iii) Cannizaro's reaction (iv) Oxime (v) Acetal
How can these conversions be done? Give chemical equations only.
(i) Propan-2-ol from propene (ii) Benzyl alcohol from benzyl chloride (iii) Propan-1-ol from ethyl magnesium chloride (iv) 2-methyl propan-2-ol from methyl magnesium bromide (v) Picric acid from phenol
Explain with reason:
(i) Cr^{2+} is a reducing agent while Mn^{3+} is an oxidising agent, while both have \(d^4\) configuration.}
The correct IUPAC name for \( CH_2 = CHCH_2NHCH_3 \) is:
Explain optical activity, chirality, retention, inversion and racemisation in Haloalkane.
Explain valence bond theory in coordination compounds.
Sweetest sugar is:
Write the IUPAC name of Acetaldehyde. Write its chemical equations with (i) NaHSO$_3$
(ii) NaOH
(iii) NH$_2$OH
(iv) CH$_3$OH in the presence of HCl gas.
Write short notes on the following:
i) Carbylamine reaction
ii) Hofmann's bromamide reaction
iii) Acetylation
Describe the laboratory method to prepare aniline and write the related chemical equation. Write also the equations of its two chemical properties and uses.
Write the structural formula of benzaldehyde. Write chemical equations of the reactions of benzaldehyde with (i) NH$_2$NH$_2$
(ii) Tollen's reagent
(iii) HNO$_3$ and H$_2$SO$_4$
(iv) NaOH.
Write the chemical equation for the preparation of anisole. Write the chemical equations of its reactions with:
i) Acetyl chloride
ii) Hydrogen iodide
iii) Mixture of conc.\ H$_2$SO$_4$ and conc.\ HNO$_3$
Prove that the time taken to complete 99.9% reaction is ten times the half-life period $(t_{1/2})$ for a first-order reaction.
Write chemical equations of two methods of preparation of glucose. How will you obtain saccharic acid and gluconic acid from glucose?
Write chemical equation for the formation of chlorobenzene by Sandmeyer reaction. How can the following compounds be obtained from chlorobenzene? Clarify giving chemical equations.
(i) Phenol
(ii) Toluene
(iii) Diphenyl
Which elements are called transition elements? Explain: (i) Transition metals generally form coloured compounds, (ii) Transition metals or ions and many of their compounds show paramagnetic behaviour.
What is electrode potential? Give the factors which affect the electrode potential of a metal.
Write the IUPAC names of the following coordinate compounds:
(i) [CrCl$_2$(en)]Cl
(ii) Cs[FeCl$_4$]
(iii) K$_3$[Co(C$_2$O$_4$)$_3$]
(iv) [CoCl$_3$(NH$_3$)$_3$]