JEE Main 2025 (Online) 8th April Evening Shift

When undergoes intramolecular aldol condensation, the major product formed is :

Choose the correct option for structures of $A$ and $B$, respectively

Match the LIST-I with LIST-II
LIST-I LIST-II A. Carbocation I. Species that can supply a pair of electrons. B. C-Free radical II. Species that can receive a pair of electrons. C. Nucleophile III. sp2 hybridized carbon with empty ...

What is the correct IUPAC name of the compound?

The equilibrium constant for decomposition of $\text{H}_2\text{O(g)}$
$ \text{H}_2\text{O(g)} \rightleftharpoons \text{H}_2\text{(g)} + \frac{1}{2}\text{O}_2\text{(g)} \quad (\Delta G^\circ = 92.34 \, \text{kJ mol}^{-1}) $
is $8.0 \times 10...

In a first order decomposition reaction, the time taken for the decomposition of reactant to one fourth and one eighth of its initial concentration are $t_1$ and $t_2$ (s), respectively. The ratio $t_1/t_2$ will be:

$\mathrm{A} \xrightarrow[\text { (i) } \mathrm{H}_3 \mathrm{O}^{+}]{\text {(i) } \mathrm{NaH}} \mathrm{B} \xrightarrow[\text { (ii) } \mathrm{H}_2 \mathrm{SO}_4, \Delta]{\text { (i) } \mathrm{EOH}} \mathrm{C}$
' A ' shows positive Lassaign'...

Match the LIST-I with LIST-IItable {width: 100%;border-collapse: collapse;margin: 20px 0;}th {background-color: blue;color: white;border: 1px solid lightgrey;padding: 10px;}td {border: 1px solid lightgrey;padding: 10px;text-align: left;}LIS...

The number of species from the following that are involved in sp3d2 hybridization is :[Co(NH3)6]3+, SF6, [CrF6]3−, [CoF6]3−, [Mn(CN)6]3−, and [MnCl6]3−

Given below are two statements:Statement I: A homoleptic octahedral complex, formed using monodentate ligands, will not show stereoisomerism.Statement II: cis- and trans- platin are heteroleptic complexes of Pd.In the light of the above sta...

The correct decreasing order of spin only magnetic moment values (BM) of Cu+, Cu2+, Cr2+ and Cr3+ ions is :

Consider the following half cell reaction\(\text{Cr}_2\text{O}_7^{2-} \, (\text{aq}) + 6\text{e}^- + 14\text{H}^+ \, (\text{aq}) \rightarrow 2\text{Cr}^{3+} \, (\text{aq}) + 7\text{H}_2\text{O} \, (\ell)\)The reaction was conducted with ...

'P' is

Choose the correct set of reagents for the following conversion.

Which one of the following reactions will not lead to the desired ether formation in major proportion?
(iso- $\mathrm{Bu} \Rightarrow$ isobutyl, sec $-\mathrm{Bu} \Rightarrow$ sec-butyl, $\mathrm{nPr} \Rightarrow \mathrm{n}$-propyl, $$ { }^...

The atomic number of the element from the following with lowest 1st ionisation enthalpy is :

Given below are two statements:Statement I: H2Se is more acidic than H2TeStatement II: H2Se has higher bond enthalpy for dissociation than H2TeIn the light of the above statements, choose the correct answer from the options given below:

Match the LIST-I with LIST-IItable {width: 100%;border-collapse: collapse;margin: 20px 0;}th {background-color: blue;color: white;border: 1px solid lightgrey;padding: 10px;}td {border: 1px solid lightgrey;padding: 10px;text-align: left;}LIS...

$\mathrm{HA}(a q) \rightleftharpoons \mathrm{H}^{+}(a q)+\mathrm{A}^{-}(a q)$The freezing point depression of a 0.1 m aqueous solution of a monobasic weak acid HA is 0.20 °C. The dissociation constant for the acid isGiven: $K_f$(H2O) = 1.8 ...

Which of the following binary mixture does not show the behaviour of minimum boiling azeotropes?

On combustion 0.210 g of an organic compound containing C, H and O gave 0.127 g H2O and 0.307 g CO2. The percentages of hydrogen and oxygen in the given organic compound respectively are:

20 mL of sodium iodide solution gave 4.74 g silver iodide when treated with excess of silver nitrate solution. The molarity of the sodium iodide solution is _______ M. (Nearest Integer value) (Given : Na = 23, I = 127, Ag = 108, N = 14, O =...

Correct statements for an element with atomic number 9 are:A. There can be 5 electrons for which $m_s = +\frac{1}{2}$ and 4 electrons for which $m_s = -\frac{1}{2}$.B. There is only one electron in $p_z$ orbital.C. The last electron goes to...

The energy of an electron in the first Bohr orbit of the H-atom is -13.6 eV. The magnitude of energy value of an electron in the first excited state of Be3+ is ________ eV (nearest integer value).

Resonance in $\mathrm{X}_2 \mathrm{Y}$ can be represented as
The enthalpy of formation of $X_2Y$ $ \left(X = X(g) + \frac{1}{2} Y = Y(g) \rightarrow X_2Y(g) \right) $ is 80 kJ mol$^{-1}$. The magnitude of resonance energy of $X_2Y$ is __ kJ...