List of top Questions asked in CBSE CLASS XII- 2026

Identify the compound produced by the reduction of ethanenitrile with lithium aluminium hydride:
The base which is present in DNA but not in RNA is:
Which of the following molecule is chiral in nature?
Identify the correct increasing order of boiling points of the given compounds:
The correct IUPAC name of the complex [Pt(NH$_3$)$_2$Cl$_2$] is:
Which of the following is heteroleptic complex?
The order for the given reaction is: \[ \text{A} + 2\text{B} \rightarrow \text{Products} \] \[ \text{Rate} = k[\text{A}]^{1/2}[\text{B}]^{1} \]
Electronic configuration of chromium is:
Identify the correct statement:
p-Nitrotoluene with \(Br_2\) (heat)
Write the major product in the following reactions: (1) Chlorobenzene + Na/dry ether
Although chlorine shows strong −I effect, it is ortho–para directing in electrophilic aromatic substitution. Why?
Predict the alkene formed by dehydrohalogenation of 1-bromo-1-cyclohexylethane.
Which isomer of C\(_4\)H\(_9\)Br is most reactive towards \(S_N2\) reaction?
Racemic mixture

Define the following terms: 
Ambident nucleophiles

Why is chloroform stored in dark coloured bottles?
What type of halide is present in the compound: \[ CH_3-CH(CH_3)-C(Cl)=CH_2 \]
Which of the following is more reactive towards \(S_N1\) reaction: 2-bromo-2-methylbutane or 1-bromopentane?
Why is Ce\(^{4+}\) in aqueous solution a good oxidising agent?
Which is the most stable oxidation state of Co and why?
Why are E\(^\circ\) values for Mn and Zn more negative than expected?
Why do transition metals form coloured compounds?
What is meant by lanthanoid contraction?
\[ 5C_2O_4^{2-} + 2MnO_4^- + 16H^+ \rightarrow \; ? \]