JEE Main 2024 (Online) 30th January Evening Shift

Salicylaldehyde is synthesized from phenol, when reacted with

m-chlorobenzaldehyde on treatment with 50% KOH solution yields :

The correct stability order of carbocations is

Which among the following purification methods is based on the principle of "Solubility" in two different solvents?

IUPAC name of following compound is :

Number of geometrical isomers possible for the given structure is/are _________.

The total number of correct statements, regarding the nucleic acids is _________.
A. RNA is regarded as the reserve of genetic information
B. DNA molecule self-duplicates during cell division
C. DNA synthesizes proteins in the cell
D. The m...

Given below are two statements:
Statement - I: Since Fluorine is more electronegative than nitrogen, the net dipole moment of \(\mathrm{NF}_3\) is greater than \(\mathrm{NH}_3\).
Statement - II: In \(\mathrm{NH}_3\), the orbital dipole due ...

The molecule / ion with square pyramidal shape is

\(\mathrm{NO}_2\) required for a reaction is produced by decomposition of \(\mathrm{N}_2 \mathrm{O}_5\) in \(\mathrm{CCl}_4\) as by equation
$$2 \mathrm{~N}_2 \mathrm{O}_{5(\mathrm{~g})} \rightarrow 4 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{O}...

The products A and B formed in the following reaction scheme are respectively

The coordination geometry around the manganese in decacarbonyldimanganese \((0)\) is

Number of complexes which show optical isomerism among the following is ________.
$$\text { cis- }\left[\mathrm{Cr}(\mathrm{ox})_2 \mathrm{Cl}_2\right]^{3-},\left[\mathrm{Co}(\text {en})_3\right]^{3+}, \text { cis- }\left[\mathrm{Pt}(\text ...

The orange colour of \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) and purple colour of \(\mathrm{KMnO}_4\) is due to

Alkaline oxidative fusion of \(\mathrm{MnO}_2\) gives "A" which on electrolytic oxidation in alkaline solution produces B. A and B respectively are

Reduction potential of ions are given below:
$$\begin{array}{ccc}
\mathrm{ClO}_4^{-} & \mathrm{IO}_4^{-} & \mathrm{BrO}_4^{-} \\
\mathrm{E}^{\circ}=1.19 \mathrm{~V} & \mathrm{E}^{\circ}=1.65 \mathrm{~V} & \mathrm{E}^{\circ}=1.74 \mathrm{~V}...

Given below are two statements:
Statement - I: High concentration of strong nucleophilic reagent with secondary alkyl halides which do not have bulky substituents will follow \(\mathrm{S}_{\mathrm{N}}{ }^2\) mechanism.
Statement - II: A sec...

2-chlorobutane \(+\mathrm{Cl}_2 \rightarrow \mathrm{C}_4 \mathrm{H}_8 \mathrm{Cl}_2\) (isomers)
Total number of optically active isomers shown by \(\mathrm{C}_4 \mathrm{H}_8 \mathrm{Cl}_2\), obtained in the above reaction is _________.

Products A and B formed in the following set of reactions are

The \(\mathrm{pH}\) of an aqueous solution containing \(1 \mathrm{M}\) benzoic acid \(\left(\mathrm{pK}_{\mathrm{a}}=4.20\right)\) and \(1 \mathrm{M}\) sodium benzoate is 4.5. The volume of benzoic acid solution in \(300 \mathrm{~mL}\) of t...

A and B formed in the following reactions are:
$$\begin{aligned}
& \mathrm{CrO}_2 \mathrm{Cl}_2+4 \mathrm{NaOH} \rightarrow \mathrm{A}+2 \mathrm{NaCl}+2 \mathrm{H}_2 \mathrm{O}, \\
& \mathrm{A}+2 \mathrm{HCl}+2 \mathrm{H}_2 \mathrm{O}_2 \ri...

Choose the correct statements about the hydrides of group 15 elements.
A. The stability of the hydrides decreases in the order \(\mathrm{NH}_3>\mathrm{PH}_3>\mathrm{AsH}_3> \mathrm{SbH}_3>\mathrm{BiH}_3\).
B. The reducing ability of the hyd...

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: \(\mathrm{H}_2 \mathrm{Te}\) is more acidic than \(\mathrm{H}_2 \mathrm{~S}\).
Reason R: Bond dissociation enthalpy of $$\mat...

Given below are two statements:
Statement - I: Along the period, the chemical reactivity of the elements gradually increases from group 1 to group 18 .
Statement - II: The nature of oxides formed by group 1 elements is basic while that of g...

Total number of species from the following which can undergo disproportionation reaction is ________.
$$\mathrm{H}_2 \mathrm{O}_2, \mathrm{ClO}_3^{-}, \mathrm{P}_4, \mathrm{Cl}_2, \mathrm{Ag}, \mathrm{Cu}^{+1}, \mathrm{~F}_2, \mathrm{NO}_2,...

Number of metal ions characterized by flame test among the following is ________.
\(\mathrm{Sr}^{2+}, \mathrm{Ba}^{2+}, \mathrm{Ca}^{2+}, \mathrm{Cu}^{2+}, \mathrm{Zn}^{2+}, \mathrm{Co}^{2+}, \mathrm{Fe}^{2+}\)

The solution from the following with highest depression in freezing point/lowest freezing point is

If a substance '\(A\)' dissolves in solution of a mixture of '\(B\)' and '\(C\)' with their respective number of moles as \(\mathrm{n}_{\mathrm{A}}, \mathrm{n}_{\mathrm{B}}\) and \(\mathrm{n}_{\mathrm{C}_3}\). Mole fraction of $$\mathrm{C}$...

Number of spectral lines obtained in \(\mathrm{He}^{+}\) spectra, when an electron makes transition from fifth excited state to first excited state will be

Two reactions are given below:
$$\begin{aligned}
& 2 \mathrm{Fe}_{(\mathrm{s})}+\frac{3}{2} \mathrm{O}_{2(\mathrm{~g})} \rightarrow \mathrm{Fe}_2 \mathrm{O}_{3(\mathrm{~s})}, \Delta \mathrm{H}^{\circ}=-822 \mathrm{~kJ} / \mathrm{mol} \\
& \...