List of top Chemistry Questions asked in CBSE CLASS XII

Indicate the type of isomerism exhibited by the following complex: $[Co(en)_3]Cl_3$
Define coordination number.
Assertion (A): Aromatic primary amines can be prepared by Gabriel phthalimide synthesis. Reason (R): Aryl halides do not undergo nucleophilic substitution with phthalimide ion. Choose the correct option:
Assertion (A): Glucose gets oxidized to six carbon gluconic acid on reaction with bromine water. Reason (R): The carbonyl group is absent in the open chain structure of glucose. Choose the correct option:
Assertion (A): The molecularity of the given reaction is 2. \[ 2\text{HI} \rightarrow \text{H}_2 + \text{I}_2 \] Reason (R): Two molecules of the reactants are involved in simultaneous collision between them. Choose the correct option:
Assertion (A): Zinc, cadmium and mercury are not considered as transition elements. Reason (R): These elements have completely filled $d$ orbitals in their ground state as well as in their common oxidation states. Choose the correct option:
Proteins are polymers of $\alpha$-amino acids which are joined to each other by:
Which of the following reactions is not explained by the open chain structure of glucose?
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:
Consider the following reaction: \[ \text{Zn}_{(s)} + \text{Ag}_2\text{O}_{(s)} + \text{H}_2\text{O}_{(l)} \rightarrow \text{Zn}^{2+}_{(aq)} + 2\text{Ag}_{(s)} + 2\text{OH}^-_{(aq)} \] Given: \[ E^\circ_{\text{Ag}^+/\text{Ag}} = 0.80 \text{ V} \] \[ E^\circ_{\text{Zn}^{2+}/\text{Zn}} = -0.76 \text{ V} \] \[ 1F = 96500 \text{ C mol}^{-1} \] $\Delta G^\circ$ for above reaction 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