WB JEE 2024

Toluene reacts with mixed acid at \(25^{\circ} \mathrm{C}\) to produce

Which hydrogen like species will have the same radius as that of \(1^{\text {st }}\) Bohr orbit of hydrogen atom?

Consider an electron moving in the first Bohr orbit of a \(\mathrm{He}^{+}\) ion with a velocity \(v_1\). If it is allowed to move in the third Bohr orbit with a velocity \(v_3\), then indicate the correct \(v_3: v_1\) ratio.

In the following sequence of reaction compound 'M' is

Ozonolysis of \(\underline{o}\)-xylene produces

The product 'P' in the above reaction is

Which of the following contains maximum number of lone pairs on the central atom?

Which of the following statements is true about equilibrium constant and rate constant of a single step chemical reaction?

For a first order reaction with rate constant \(\mathrm{k}\), the slope of the plot of \(\log\) (reactant concentration) against time is

Which of the following ion/ions is/are diamagnetic ?

Identify the ion having \(4 f^6\) electronic configuration.

Which of the following species exhibits both LMCT and paramagnetism?

Identify the correct statement(s) :

The compressibility factor for a van der Waal gas at high pressure is

The correct acidity order of phenol (I), 4-hydroxybenzaldehyde (II) and 3-hydroxybenzaldehyde (III) is

The reactivity order of the following molecules towards \(\mathrm{S}_{\mathrm{N}} 1\) reaction is
$$\begin{array}{ccc}
\text { Allyl chloride } & \text { Chlorobenzene } & \text { Ethyl chloride } \\
\text { (I) } & \text { (II) } & \text {...

The major product of the following reaction is :

Which of the following statements about the \(\mathrm{S}_{\mathrm{N}} 2\) reaction mechanism is/are true?

The decreasing order of reactivity of the following alkenes towards \(\mathrm{HBr}\) addition is

\(\mathrm{Q}\) and \(\mathrm{R}\) in the above reaction sequences are respectively

The compounds A and B are respectively

Correct solubility order of \(\mathrm{AgF}, \mathrm{AgCl}, \mathrm{AgBr}, \mathrm{AgI}\) in water is

At 25\(^\circ\)C, the ionic product of water is 10\(^{-14}\). The free energy change for the self-ionization of water in kCal mol\(^{-1}\) is close to

Number of moles of ions produced by complete dissociation of one mole of Mohr's salt in water is

What will be the change in acidity if
(i) \(\mathrm{CuSO}_4\) is added in saturated \((\mathrm{NH}_4)_2 \mathrm{SO}_4\) solution
(ii) \(\mathrm{SbF}_5\) is added in anhydrous \(\mathrm{HF}\)

Equal volumes of aqueous solution of \(0.1(\mathrm{M}) \mathrm{HCl}\) and \(0.2(\mathrm{M}) \mathrm{H}_2 \mathrm{SO}_4\) are mixed. The concentration of \(\mathrm{H}^{+}\) ions in the resulting solution is

\(\mathrm{pH}\) of \(10^{-8}(\mathrm{M}) \mathrm{~HCl}\) solution is

The specific conductance \((\mathrm{k})\) of \(0.02(\mathrm{M})\) aqueous acetic acid solution at \(298 \mathrm{~K}\) is \(1.65 \times 10^{-4} \mathrm{~S} \mathrm{~cm}^{-1}\). The degree of dissociation of acetic acid is
$$[\lambda_{\mathrm...

Which of the following represent(s) the enantiomer of Y ?

Which of the following statement/statements is/are correct ?

The correct order of boiling point of the given aqueous solutions is

The compound that does not give positive test for nitrogen in Lassaigne's test is

After the emission of a \(\beta\)-particle followed by an \(\alpha\)-particle from \({ }_{83}^{214} \mathrm{Bi}\), the number of neutrons in the atom is -

The equivalent weight of \(\mathrm{Na}_2 \mathrm{S}_2 \mathrm{O}_3(\mathrm{Gram}\) molecular weight \(=\mathrm{M})\) in the given reaction is
$$\mathrm{I}_2+2 \mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3=2 \mathrm{NaI}+\mathrm{Na}_2 \mathrm{~S}...

Metallic conductors and semiconductors are heated separately. What are the changes with respect to conductivity?

The number(s) of \(-\mathrm{OH}\) group(s) present in \(\mathrm{H}_3 \mathrm{PO}_3\) and \(\mathrm{H}_3 \mathrm{PO}_4\) is/are

How many \(\mathrm{P}-\mathrm{O}-\mathrm{P}\) linkages are there in \(\mathrm{P}_4 \mathrm{O}_{10}\)

Identify the incorrect statement among the following :

Which of the following statements is correct for a spontaneous polymerization reaction ?

For a spontaneous process, the incorrect statement is

\(f(x)=\cos x-1+\frac{x^2}{2!}, x \in \mathbb{R}\) Then \(\mathrm{f}(x)\) is

Let \(\mathrm{y}=\mathrm{f}(x)\) be any curve on the \(\mathrm{X}-\mathrm{Y}\) plane & \(\mathrm{P}\) be a point on the curve. Let \(\mathrm{C}\) be a fixed point not on the curve. The length \(\mathrm{PC}\) is either a maximum or a minimum...

If a particle moves in a straight line according to the law \(x=a \sin (\sqrt{\lambda} t+b)\), then the particle will come to rest at two points whose distance is [symbols have their usual meaning]

Let \(\mathrm{f}: \mathbb{R} \rightarrow \mathbb{R}\) be given by \(\mathrm{f}(x)=\left|x^2-1\right|\), then

Consider the function \(\mathrm{f}(x)=x(x-1)(x-2) \ldots(x-100)\). Which one of the following is correct?

The acceleration f \(\mathrm{ft} / \mathrm{sec}^2\) of a particle after a time \(\mathrm{t}\) sec starting from rest is given by \(\mathrm{f}=6-\sqrt{1.2 \mathrm{t}}\). Then the maximum velocity \(\mathrm{v}\) and time \(\mathrm{T}\) to att...

The area bounded by the curves \(x=4-y^2\) and the Y-axis is

Consider the function \(\mathrm{f}(x)=(x-2) \log _{\mathrm{e}} x\). Then the equation \(x \log _{\mathrm{e}} x=2-x\)

If \(\left(1+x+x^2+x^3\right)^5=\sum_\limits{k=0}^{15} a_k x^k\) then \(\sum_\limits{k=0}^7(-1)^{\mathbf{k}} \cdot a_{2 k}\) is equal to

The coefficient of \(a^{10} b^7 c^3\) in the expansion of \((b c+c a+a b)^{10}\) is