List of top Chemistry Questions asked in WBJEE

The compressibility factor for a van der Waals gas at high pressure is
Consider an electron moving in the first Bohr orbit of a He\(^+\) ion with velocity \(v_1\). If it is allowed to move in the third Bohr orbit with velocity \(v_3\), determine the correct \(v_3 : v_1\) ratio.\\
The compound that does not give a positive test for nitrogen in Lassaigne’s test is
The major product of the following reaction is:
major product
The compounds A and B are respectively:
compounds A and B
The correct acidity order of phenol (I), 4-hydroxybenzaldehyde (II), and 3-hydroxybenzaldehyde (III) is:
The product ’P’ in the above reaction is:
product p
The reactivity order of the following molecules towards SN1 reaction is:
Allyl chloride (I), Chlorobenzene (II), Ethyl chloride (III)
Ozonolysis of o-xylene produces:
Ozonolysis of o-xylene
The decreasing order of reactivity of the following alkenes towards HBr addition is: \(\text{CH}_3-\text{CH}=\text{CH}_2 \, (\text{I}), \quad \text{CF}_3-\text{CH}=\text{CH}_2 \, (\text{II}), \quad \text{MeOCH}=\text{CH}_2 \, (\text{III}),\) alkenes, \((\text{IV}) \)
Toluene reacts with mixed acid at 25°C to produce:
In the following sequence of reactions, compound 'M' is:

\( \text{M} \xrightarrow{\text{CH}_3\text{MgBr}} \text{N} + \text{CH}_4 \uparrow \xrightarrow{\text{H}^+} \text{CH}_3\text{COCH}_2\text{COCH}_3 \)

Identify the ion having 4f\(^6\) electronic configuration.}\\[6pt]
The equivalent weight of \(\text{Na}_2\text{S}_2\text{O}_3\) (Gram molecular weight = \(M\)) in the given reaction is:
\[\text{I}_2 + 2 \text{Na}_2\text{S}_2\text{O}_3 \rightarrow 2 \text{NaI} + \text{Na}_2\text{S}_4\text{O}_6\]
Metallic conductors and semiconductors are heated separately. What are the changes in conductivity?
The correct order of boiling points of N-ethylethanamine(I), ethoxyethane(II) and butan-2-ol(III) is
4f2 electronic configuration is found in
The calculated spin-only magnetic moment values in BM for [FeCl4]- and [Fe(CN)6]3- are

The equivalent weight of KIO3 in the given reaction is (M=molecular mass) :
2Cr(OH)3 + 4OH + KIO3 → 2CrO42- + 5H2O +KI

(i)(ii)(iii)
The correct order of C = O bond length in ethyl propanoate(I), ethyl propenoate(II) and ethenyl propanoate(III) is
An electron in the 5d orbital can be represented by the following(n,1,mr) values
The correct set(s) of reactions to synthesize benzoic acid starting from benzene is/are
The conversion(s) that can be carried out by bromine in carbon tetrachloride solvent is/are

If all the nucleophilic substitution reactions at saturated carbon atoms in the above sequence of reactions follow Sn2 mechanism, then E and F will be respectively,
Which of the following mixtures act(s) as a buffer solution?