NEET 2024

The products \(\mathrm{A}\) and \(\mathrm{B}\) obtained in the following reactions, respectively, are
$$\begin{aligned}
& 3 \mathrm{ROH}+\mathrm{PCl}_3 \rightarrow 3 \mathrm{RCl}+\mathrm{A} \\
& \mathrm{ROH}+\mathrm{PCl}_5 \rightarrow \math...

Major products A and B formed in the following reaction sequence, are

Which one of the following alcohols reacts instantaneously with Lucas reagent?

Match List I with List II.

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For the given reaction:

'P' is

Identify the correct reagents that would bring about the following transformation.

The reagents with which glucose does not react to give the corresponding tests/products are
A. Tollen's reagent
B. Schiff's reagent
C. HCN
D. \(\mathrm{NH}_2 \mathrm{OH}\)
E. \(\mathrm{NaHSO}_3\)
Choose the correct options from the given be...

Fehling's solution 'A' is

Given below are two statements:
Statement I: The boiling point of hydrides of Group 16 elements follow the order
\(\mathrm{H}_2 \mathrm{O}>\mathrm{H}_2 \mathrm{Te}>\mathrm{H}_2 \mathrm{Se}>\mathrm{H}_2 \mathrm{S} \text {. }\)
Statement II: ...

Match List I with List II.

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Identify the correct answer.

Intramolecular hydrogen bonding is present in

Match List I with List II.

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In which of the following equilibria, \(\mathrm{K}_p\) and \(\mathrm{K}_{\mathrm{c}}\) are NOT equal?

For the reaction \(2 \mathrm{~A} \rightleftharpoons \mathrm{B}+\mathrm{C}, \mathrm{K}_{\mathrm{c}}=4 \times 10^{-3}\). At a given time, the composition of reaction mixture is:
\([A]=[B]=[C]=2 \times 10^{-3} \mathrm{M} \text {. }\) Then, whi...

Consider the following reaction in a sealed vessel at equilibrium with concentrations of \(\mathrm{N}_2=3.0 \times 10^{-3} \mathrm{M}, \mathrm{O}_2=4.2 \times 10^{-3} \mathrm{M}\) and \(\mathrm{NO}=2.8 \times 10^{-3} \mathrm{M}\).
$$2 \math...

Activation energy of any chemical reaction can be calculated if one knows the value of

The rate of a reaction quadruples when temperature changes from \(27^{\circ} \mathrm{C}\) to \(57^{\circ} \mathrm{C}\). Calculate the energy of activation.
Given $$\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}, \log 4=0.6...

Which plot of \(\ln \mathrm{k}\) vs \(\frac{1}{\mathrm{~T}}\) is consistent with Arrhenius equation?

Match List I with List II.

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Given below are two statements :
Statement I : \([\mathrm{Co}(\mathrm{NH}_3)_6]^{3+}\) is a homoleptic complex whereas \([\mathrm{Co}(\mathrm{NH}_3)_4 \mathrm{Cl}_2]^{+}\) is a heteroleptic complex.
Statement II : Complex $$[\mathrm{Co}(\ma...

Given below are two statements :
Statement I: Both \([\mathrm{Co}(\mathrm{NH}_3)_6]^{3+}\) and \([\mathrm{CoF}_6]^{3-}\) complexes are octahedral but differ in their magnetic behaviour.
Statement II: \([\mathrm{Co}(\mathrm{NH}_3)_6]^{3+}\) ...

'Spin only' magnetic moment is same for which of the following ions?
A. \(\mathrm{Ti}^{3+}\)
B. \(\mathrm{Cr}^{2+}\)
C. \(\mathrm{Mn}^{2+}\)
D. \(\mathrm{Fe}^{2+}\)
E. \(\mathrm{Sc}^{3+}\)
Choose the most appropriate answer from the options...

The \(\mathrm{E}^{\circ}\) value for the \(\mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}\) couple is more positive than that of \(\mathrm{Cr}^{3+} / \mathrm{Cr}^{2+}\) or \(\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}\) due to change of

The pair of lanthanoid ions which are diamagnetic is

Match List I with List II.

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Mass in grams of copper deposited by passing 9.6487 A current through a voltmeter containing copper sulphate solution for 100 seconds is (Given : Molar mass of $$\mathrm{Cu}: 63 \mathrm{~g} \mathrm{~mol}^{-1}, 1 \mathrm{~F}=96487 \mathrm{C}...

The compound that will undergo SN1 reaction with the fastest rate is

Identify the major product C formed in the following reaction sequence :
\(\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{I} \xrightarrow{\mathrm{NaCN}} \mathrm{A}\)
$$\mathrm{\mathrel{\mathop{\kern0pt\longrightarrow}
\limits_{Partial\...

Given below are two statements:
Statement I : Aniline does not undergo Friedel-Crafts alkylation reaction.
Statement II : Aniline cannot be prepared through Gabriel synthesis.
In the light of the above statements, choose the correct answer ...

Among Group 16 elements, which one does NOT show -2 oxidation state?

Given below are certain cations. Using inorganic qualitative analysis, arrange them in increasing group number from 0 to \(\mathrm{VI}\).
A. \(\mathrm{Al}^{3+}\)
B. \(\mathrm{Cu}^{2+}\)
C. \(\mathrm{Ba}^{2+}\)
D. \(\mathrm{Co}^{2+}\)
E. $$\...

Arrange the following elements in increasing order of first ionization enthalpy:
\(\mathrm{Li}, \mathrm{Be}, \mathrm{B}, \mathrm{C}, \mathrm{N}\)
Choose the correct answer from the options given below:

Arrange the following elements in increasing order of electronegativity:
N, O, F, C, Si
Choose the correct answer from the options given below :

Which reaction is NOT a redox reaction?

The Henry's law constant \((\mathrm{K}_{\mathrm{H}})\) values of three gases \((\mathrm{A}, \mathrm{B}, \mathrm{C})\) in water are \(145, 2 \times 10^{-5}\) and \(35 \mathrm{~kbar}\) respectively. The solubility of these gases in water foll...

The plot of osmotic pressure (П) vs concentration \((\mathrm{mol} \mathrm{~L}^{-1})\) for a solution gives a straight line with slope \(25.73 \mathrm{~L} \mathrm{~bar} \mathrm{~mol}^{-1}\). The temperature at which the osmotic pressure meas...

1 gram of sodium hydroxide was treated with \(25 \mathrm{~mL}\) of \(0.75 \mathrm{~M} \mathrm{~HCl}\) solution, the mass of sodium hydroxide left unreacted is equal to

The highest number of helium atoms is in

A compound X contains \(32 \%\) of A, \(20 \%\) of B and remaining percentage of C. Then, the empirical formula of \(\mathrm{X}\) is :
(Given atomic masses of A=64 ; B=40 ; C=32 u)

Given below are two statements:
Statement I : The boiling point of three isomeric pentanes follows the order
n-pentane > isopentane > neopentane
Statement II : When branching increases, the molecule attains a shape of sphere. This results i...

On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as

During the preparation of Mohr's salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of \(\mathrm{Fe}^{2+}\) ion?

The most stable carbocation among the following is :

A compound with a molecular formula of \(\mathrm{C}_6 \mathrm{H}_{14}\) has two tertiary carbons. Its IUPAC name is :

The energy of an electron in the ground state \(\mathrm{(n=1)}\) for \(\mathrm{He}^{+}\) ion is \(\mathrm{-x} \mathrm{~J}\), then that for an electron in \(\mathrm{(n=2)}\) state for \(\mathrm{Be}^{3+}\) ion in \(\mathrm{J}\) is

Match List I with List II.

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In which of the following processes entropy increases?
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from \(130 \mathrm{~K}\) to \(0 \mathrm{~K}\).
C. $$2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm...

Match List I with List II.

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The work done during reversible isothermal expansion of one mole of hydrogen gas at \(25^{\circ} \mathrm{C}\) from pressure of 20 atmosphere to 10 atmosphere is (Given \(\mathrm{R}=2.0 \mathrm{~cal} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\))