List of top Chemistry Questions asked in CBSE CLASS XII

How will you convert the following?
(i) Toluene to Benzoic acid:
(ii) Ethanol to 3-Hydroxybutanal:
Alkyl halides give alcohol with aqueous KOH whereas in the presence of alcoholic KOH, alkenes are formed. Give reasons.
What happens when D-glucose is treated with the following reagents? 
(a) Br$_2$ water 
(b) HCN
In the following pair of compounds, which compound undergoes an $\text{S}_{N}$2 reaction faster and why?
compound undergoes an SN2

Give plausible explanation for: 
(a) Diazonium salts of aromatic amines are stable.
(b) Aniline does not undergo Friedel-Crafts reaction. 
(c) Aniline on nitration gives substantial meta product.

Write the reaction of glucose with:
(a) HI
(b) Br₂ water

Write the reaction involved in:
(a) Reimer-Tiemann reaction
(b) Kolbe's reaction

The correct IUPAC name of (CH₃)₃C-CH₂Br is:

Which of the following does not undergo Aldol condensation?

Write the chemical equations when:
(a) Ethanal is treated with 2,4-dinitrophenylhydrazine?
(b) Propanone is treated with Zn(Hg) and conc. HCl?
For a chemical reaction \( R \to P \), the variation in the concentration \([R]\) vs time \( t \) plot is given as:
variation in the concentration

(a) Predict the order of the reaction and write the unit of rate constant (\( k \)) for this order of reaction.
(b) What is the slope of the curve?
Assertion (A): \( \Delta_{\text{mix}} H \) for an ideal solution is not equal to zero.
Reason (R): A–B interactions in an ideal solution are the same as between A–A and B–B interactions.
Assertion (A): \( p \)-nitroaniline is a weaker base than \( p \)-toluidine.
Reason (R): The electron-donating \( -NO_2 \) group in \( p \)-nitroaniline makes it a weaker base.
Assertion (A): Fluoroacetic acid is a stronger acid than chloroacetic acid. Reason (R): This is due to greater electron-withdrawing nature of \( F \) than \( Cl \).
All proteins on hydrolysis give:
The suitable Grignard reagent used for the synthesis of
Grignard reagent

with methanal is:
Which of the following has the highest boiling point?
The product (X) obtained in the following reaction is:
product (X) obtained
Which of the following is most reactive towards nucleophilic substitution reaction?
In the Arrhenius equation, when \( \log k \) is plotted against \( 1/T \), a straight line is obtained whose:
A zero-order reaction is one whose rate is independent of:
The system that forms maximum boiling azeotrope is:
Maltose is made up of:
Which of the following is the strongest acid?
The equilibrium \( \text{Cr}_2\text{O}_7^{2-} \rightleftharpoons 2\text{CrO}_4^{2-} \):