JEE Main 2025 (Online) 7th April Evening Shift

" P " is an optically active compound with molecular formula $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}$. When ' P ' is treated with 2, 4-dinitrophenylhydrazine, it gives a positive test. However, in presence of Tollens reagent, " P " gives a...

Identify the structure of the final product (D) in the following sequence of the reactions :

Total number of $\mathrm{sp}^2$ hybridised carbon atoms in product D is ____________.

The descending order of basicity of the following amines is :



(D) $ \mathrm{CH}_3 \mathrm{NH}_2$
(E) $\left(\mathrm{CH}_3\right)_2 \mathrm{NH}$
Choose the correct answer from the options given below :

The number of optically active products obtained from the complete ozonolysis of the given compound is :

Given below are two statements :Statement (I) : On hydrolysis, oligo peptides give rise to fewer number of α-amino acids while proteins give rise to a large number of β-amino acids.Statement (II) : Natural proteins are denatured by acids wh...

In SO2, NO2$-$ and N3$-$, the hybridizations at the central atom are respectively :

Given below are two statements :Statement (I) : is more polar than Statement (II) : Boiling point of is lower than but it is more polar than .In the light of the above statements, choose the most appropriate answer from the options given...

A(g) → B(g) + C(g) is a first order reaction.




Time
t
∞




Psystem
Pt
P∞




The reaction was started with reactant A only. Which of the following expressions is correct for ra...

Match List - I with List - II.

List - I (Conversion)
List - II (Reagents, Conditions used)



(I) Warm H2O



(II) (a) NaOH, 368K; (b) H3O+



(III) (a) NaOH, 443K; (b) H3O+



(IV)...

Match List - I with List - II.

List - I (Complex)
List - II (Primary valency and Secondary valency)


(A) [Co(en)2Cl2]Cl
(I) 3,    6


(B) [Pt(NH3)2Cl(NO2)]
(II) 3,    4


(C) Hg [Co(SCN)4]
(II...

The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively : [Fe(CN)6]3−, [FeF6]3−, [CoF6]3−, [Mn(CN)6]3−

'X' is the number of acidic oxides among VO2, V2O3, CrO3, V2O5 and Mn2O7. The primary valency of cobalt in [Co(H2NCH2CH2NH2)3]2(SO4)3 is Y. The value of X + Y is _________.

The number of paramagnetic metal complex species among $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+},\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$, $\left[\mathrm{MnCl}_6\right]^{3-},\left[\mathrm{Mn}(\...

Given below are two statements : 1 M aqueous solutions of each of Cu(NO3)2, AgNO3, Hg2(NO3)2, Mg(NO3)2 are electrolysed using inert electrodes. Given: E0Ag+/Ag = 0.80 V, E0Hg22+/Hg = 0.79 V, E0Cu2+/Cu = 0.24 V and E0Mg2+/Mg = -2.37 V.Statem...

One litre buffer solution was prepared by adding 0.10 mol each of $\mathrm{NH}_3$ and $\mathrm{NH}_4 \mathrm{Cl}$ in deionised water. The change in pH on addition of 0.05 mol of HCl to the above solution is ______________ $\times 10^{-2}$.
...

The correct statements from the following are :(A) Tl3+ is a powerful oxidising agent(B) Al3+ does not get reduced easily(C) Both Al3+ and Tl3+ are very stable in solution(D) Tl1+ is more stable than Tl3+(E) Al3+ and Tl1+ are highly stableC...

Choose the incorrect trend in the atomic radii (r) of the elements.

A mixture of 1 g each of chlorobenzene, aniline, and benzoic acid is dissolved in 50 mL ethyl acetate and placed in a separating funnel. 5 M NaOH (30 mL) was added in the same funnel. The funnel was shaken vigorously and then kept aside. Th...

In Dumas' method 292 mg of an organic compound released 50 mL of nitrogen gas $\left(\mathrm{N}_2\right)$ at 300 K temperature and 715 mm Hg pressure. The percentage composition of ' N ' in the organic compound is _____________ % (Nearest i...

Liquid A and B form an ideal solution. The vapour pressures of pure liquids A and B are 350 and 750 mm Hg respectively at the same temperature. If $x_A$ and $x_B$ are the mole fraction of A and B in solution while $y_A$ and $y_B$ are the mo...

Match List - I with List - II.


List - I
List - II


(A) Solution of chloroform and acetone
(I) Minimum boiling azeotrope


(B) Solution of ethanol and water
(II) Dimerizes


(C) Solution of benzen...

Butane reacts with oxygen to produce carbon dioxide and water following the equation given below.
$$ \mathrm{C}_4 \mathrm{H}_{10}(\mathrm{~g})+\frac{13}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow 4 \mathrm{CO}_2(\mathrm{~g})+5 \mathrm{H}_2 \m...

The extra stability of half-filled subshell is due to :
(A) Symmetrical distribution of electrons
(B) Smaller coulombic repulsion energy
(C) The presence of electrons with the same spin in non-degenerate orbitals
(D) Larger exchange energy
...

The hydration energies of $K^+$ and $Cl^-$ are $-x$ and $-y$ kJ/mol respectively. If the lattice energy of KCl is $-z$ kJ/mol, then the heat of solution of KCl is :

The correct statement amongst the following is :