List of top Chemistry Questions asked in CBSE CLASS XII

On hydrolysis, which of the following carbohydrates gives only $\mathrm{\beta}$-glucose ?
Why is o-nitrophenol more acidic than o-methoxyphenol?
What happens when acidic solution of potassium permanganate is allowed to stand for sometime ? Give the equation involved. What is this type of reaction called ?
Write mechanism of acid dehydration of ethanol to ethene.
Predict the alkene that would be formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.
Give structures of A, B and C: Aniline $\xrightarrow{Br_2/H_2O}$ A $\xrightarrow{NaNO_2+HCl, 0-5^\circ C}$ B $\xrightarrow{H_3PO_2+H_2O}$ C
Explain: (i) Presence of carbonyl group in glucose. (ii) Presence of five $-$OH groups attached to different carbon atoms.
What are reducing sugars?
Predict the alkene formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.
Though chlorine shows strong $-I$ effect, why is it ortho/para directing?
Which isomer of $C_4H_9Br$ is most reactive towards $S_N1$ reaction?
61 g benzoic acid (M = 122 g mol$^{-1}$) dissolved in 500 g benzene. Vapour pressure of pure benzene = 66 torr. Assume complete dimerisation. Calculate vapour pressure of solution.
Give structures of A, B and C: $CH_3Cl \xrightarrow{KCN}$ A $\xrightarrow{LiAlH_4}$ B $\xrightarrow{CHCl_3 + \text{alc. } KOH, \Delta}$ C
Why is DC not used for measuring resistance of ionic solution?
Why are products of electrolysis of $AgNO_3$ different with silver electrodes and platinum electrodes?
Under what condition can a bimolecular reaction become kinetically first order?
When $CoCl_3 \cdot 6NH_3$ is mixed with excess $AgNO_3$ solution, 3 moles of $AgCl$ are precipitated per mole. Write its structural formula, IUPAC name, hybridisation and magnetic behaviour (VBT).
Draw the structures of major products: (a) Chlorobenzene + $CH_3Cl$ / Na, dry ether
(b) p-Hydroxyphenethyl alcohol + HBr
How does sprinkling of salt help in clearing snow-covered roads in hilly areas? Name the colligative property involved.
Reactions of which order show rate independent of concentration of reactant? Give one example.
Name the sugar present in sugarcane. What are the hydrolysis products of this sugar? Is this sugar a reducing sugar?
Explain with the help of Henry's law: (i) Bends (ii) Anoxia
Write the formulas of: (a) Mercury(I) tetrathiocyanato-S-cobaltate(III)
(b) Dichloridobis(ethane-1,2-diamine)platinum(IV) nitrate
Consider the cell at 298 K: $Mg(s)|Mg^{2+}(1.0M)||Cu^{2+}(1.0M)|Cu(s)$. How can we increase the emf of the cell using the same substances?
Assertion (A): Alcohols act as Bronsted bases as well as Bronsted acids.
Reason (R): Alcohols react as both nucleophiles and electrophiles.