JEE Advanced 2026 Paper 1 Online

Considering LiBH4 reduces an ester group to the corresponding alcohol and does not reduce a carboxylic acid group, the correct statement about the major products P, Q, R and S is:

In the following reaction sequence, Q, R, S and T are the major products.The correct statement(s) about Q, R, S and T is(are) :

The sum of total number of carbonyl groups ($> {C}= {O}$) present in the major products X and Y in the following reactions is _____.

The List-II contains products obtained from the reaction of compounds in List-I with $O_3$/Zn-$H_2O$ followed by cyclization (via more stable enolate) in the presence of aqueous NaOH. Match each entry in List-I with appropriate entry in Lis...

Match the major products obtained in the reactions given in List-I with the corresponding structures in List-II and choose the correct option.




List-I
List-II







(P)




...

The correct order of dipole moments for the given species is

Consider the following species:
SOCl$_2$, XeOF$_4$, ClF$_3$, ClF$_5$, XeF$_5^+$, SO$_3^{2-}$, XeF$_3^+$, SF$_4$
List-I contains different molecular shapes and List-II contains total number of species with the same molecular shapes from the ...

For a reversible reaction $R \rightleftharpoons P$, at constant temperature, both the forward and the backward reactions are first order elementary reactions with rate constants $k_{{f}}$ and $k_{{b}}$, respectively. At time zero, the conce...

The total number of all possible isomers for the square planar complex with formula
$\mathrm{K[M(NCS)(NO_2)(gly)]}$ is ______.
($\mathrm{M} = \text{metal ion and } \mathrm{gly} = \mathrm{NH_2CH_2COO^-}$)

Two cylinders, both fitted with frictionless pistons, are filled with mixtures of He and Ar gases. In the first cylinder, the masses of He and Ar are $m_1$ and $m_2$, respectively. In the second cylinder, the masses of He and Ar are $m_2$ a...

Treatment of buta-1,3-diyne with NaNH2 (2 equivalents), followed by reaction with excess of trans-CH3-CH=CH-CH2-Br gives X as the major product. The maximum number of carbon atoms that are collinear (in a straight line) in X is _____.

Correct statement(s) about the compounds X, Y and Z is (are)

Reaction of PtF6 with oxygen (O2) gas results in the formation of an ionic compound, X+Y-.Correct statement(s) is(are)

The 2s and the 2p orbital energies of hydrogen atom are $E_{2s}({H})$ and $E_{2p}({H})$, respectively. The 2s and the 2p orbital energies of lithium atom are $E_{2s}({Li})$ and $E_{2p}({Li})$, respectively. The correct option(s) about the o...

An ideal gas (0.5 mol), initially at 2 bar pressure, is compressed at a constant temperature of 600 K in two steps: first, against a constant external pressure of P bar (2 < P < 8), and then against constant external pressure of 8 bar. At e...

List-I contains various physical/chemical processes, and List-II contains combinations of changes in enthalpy ($\Delta H$) and entropy ($\Delta S$). Match each entry in List-I to the appropriate entry in List-II, and choose the correct opti...