COMEDK 2024 Evening Shift

Two statements, Assertion and Reason are given below. Choose the correct option.
Assertion: n-propyl tert-butyl ether can be readily prepared in the laboratory by Williamson's synthesis.
Reason: The reaction occurs by $$\mathrm{S}_{\mathrm{...

4 statements are given below. Identify the incorrect statement
A. Phenol has lower \(\mathrm{pK}_{\mathrm{a}}\) value than \(\mathrm{p}\)-cresol
B. 2-Chlorophenol is more acidic than phenol
C. Ortho and para nitrophenols can be separated by...

Compounds \(\mathrm{A}\) and \(\mathrm{B}\), having the same molecular formula \((\mathrm{C}_4 \mathrm{H}_8 \mathrm{O})\), react separately with \(\mathrm{CH}_3 \mathrm{MgBr}\), followed by reaction with dil. \(\mathrm{HCl}\) to form compou...

What is/are the product/s formed when Benzaldehyde and Ethanal react in presence of dil. \(\mathrm{NaOH}\) followed by heating the intermediate product formed?

Given are the names of 4 compounds. Two of these compounds will not undergo Cannizzaro's reaction. Identify the two.
A. 2-Chlorobutanal
B. 2,2-Dimethylpropanal
C. Benzaldehyde
D. 2-Phenyl ethanol

Identify the end-product [D] formed when solution salicylate undergoes the following series of reactions

Which one of the following is the correct order of reagents to be used to convent [A] to [X] ?

\(\text { Reagents: } \mathrm{PCC}, \mathrm{PCl}_5, \mathrm{LiAlH}_4, \frac{\mathrm{KCN}}{\mathrm{H}_3 \mathrm{O}^{+}}\)

What are the Principal & Azimuthal quantum number values of the valence electrons in tripositive Lutetium?

What is the wave number (Units \(\mathrm{cm}^{-1}\)) of the longest wave length transition in the Balmer series of Hydrogen spectrum? \(Z=1 \text { for } H\)

Two statements, Assertion and Reason are given. Choose the correct option from the following.
Assertion: In the secondary structure of RNA, double helix structure is formed.
Reason: In the double structure of RNA, two nucleic acid chains ar...

Given are 4 statements related to the chemical properties of Glucose.
Identify the two incorrect statements from the following.
A. It reacts with \(\mathrm{Br}_2\) (aq) to form Saccharic acid.
B. Reacts with Acetic anhydride to form Glucose...

Match the Vitamins given in Column I with the diseases caused by their deficiency as given in Column II.

.tg {border-collapse:collapse;border-spacing:0;}
.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, san...

Identify the final product \([\mathrm{D}]\) formed when Benzyl alcohol undergoes the following series of reactions
$$\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{OH}+\mathrm{SOCl}_2 \rightarrow[\mathrm{A}]+\mathrm{KCN} \rightarrow[\mathr...

Identify the final product formed when Benzamide undergoes the following reactions:

Choose the incorrect statement from the following:
A. Isoelectronic molecules/ions have the same bond order.
B. Dipole moment of \(\mathrm{NH}_3\) is greater than that of \(\mathrm{NF}_3\).
C. The Carbon in Methyl Carbocation is $$\mathrm{s...

Which of the following two molecular species are Diamagnetic in nature?
\([\mathrm{A}]=\mathrm{O}_2^{-} \quad[\mathrm{B}] .=\mathrm{N}_2^{+} \quad[\mathrm{C}]=\mathrm{C}_2 \quad[\mathrm{D}]=\mathrm{O}_2{ }^{2-}\)

Identify the pair of molecules in which one of them is a molecule with an odd electron and the other has an expanded octet.

At \(700 \mathrm{~K}\), the Equilibrium constant value for the formation of \(\mathrm{HI}\) from \(\mathrm{H}_2\) and \(\mathrm{I}_2\) is 49.0 .
0.7 mole of \(\mathrm{HI}(\mathrm{g})\) is present at equilibrium. What will be the concentrati...

For a given reaction, ,\(\mathrm{X}(\mathrm{g})+\mathrm{Y}(\mathrm{g} \rightarrow \mathrm{Z}(\mathrm{g})\), the order of reaction with respect to \(\mathrm{X}\) and \(\mathrm{Y}\) are \(\mathrm{m}\) and \(\mathrm{n}\) respectively. If the c...

The following data was recorded for the decomposition of XY compound at 750K

.tg {border-collapse:collapse;border-spacing:0;}
.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px;
ov...

The Activation energy for the reaction \(A \rightarrow B+C\), at a temperature \(\mathrm{TK}\) was \(0.04606 \mathrm{~RT} \mathrm{~J} / \mathrm{mol}\). What is the ratio of Arrhenius factor to the Rate constant for this reaction?

For a reaction \(5 X+Y \rightarrow 3 Z\), the rate of formation of \(Z\) is \(2.4 \times 10^{-5} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\) Calculate the average rate of disappearance of \(\mathrm{X}\).

In the presence of a catalyst at a given temperature of \(27^{\circ} \mathrm{C}\), the Activation energy of a specific reaction is reduced by \(100 \mathrm{~J} / \mathrm{mol}\). What is the ratio between the rate constants for the catalysed...

A compound having molecular formula \(\mathrm{C}_4 \mathrm{H}_{11} \mathrm{N}\), reacts with \(\mathrm{CHCl}_3\) in alcoholic \(\mathrm{KOH}\), on heating, to form a compound with a foul smell. Identify the optically active isomer of the co...

One of the reactions A, B, C, D given below yields a product which will not answer Hinsberg's test when reacted with Benzene sulphonyl chloride. Identify the reaction.

Which of the following 2 compounds exhibit both Geometrical and Structural isomerism?
$$\begin{aligned}
& \mathrm{A}=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right] \mathrm{NO}_2 \\
& \mathrm{~B}=\left[\mathrm{Co}\left(\m...

Based on Valence Bond Theory, match the complexes listed in Column I with the number of unpaired electrons on the central metal ion, given in Column II

.tg {border-collapse:collapse;border-spacing:0;}
.tg td{border-color:black;border-styl...

Based on Crystal Field theory, match the Complex ions listed in Column I with the electronic configuration in the d orbitals of the central metal ion listed in Column II.

.tg {border-collapse:collapse;border-spacing:0;}
.tg td{border-colo...

Given below are 4 statements. Two of these are correct statements. Identify them.
A. \(\mathrm{Co}^{2+}\) is easily oxidised to \(\mathrm{Co}^{3+}\) in the presence of a strong ligand like \(\mathrm{CN}^{-}\)
B. $$[\mathrm{Fe}(\mathrm{CN})_...

An inorganic compound \(\mathrm{W}\) undergoes the following reactions:
$$
\begin{gathered}
W+\frac{\mathrm{Na}_2 \mathrm{CO}_3}{\mathrm{O}_2 / \text { heat }} \rightarrow X+\frac{\mathrm{H}^{+}}{} \rightarrow Y_{(s)} \\
Y(a q)+\mathrm{KCl}...

The Lanthanoid ion which would form coloured compounds is -------------.
Atomic numbers: \(\mathrm{Yb}=70, \quad \mathrm{Lu}=71, \mathrm{Pr}=59, \quad \mathrm{La}=57\)

Identify the correct statement from the following.

Identify the correct statement regarding corrosion of iron rod left exposed to atmosphere.

A dry cell consists of a moist paste of \(\mathrm{NH}_4 \mathrm{Cl}\) and \(\mathrm{ZnCl}_2\) contained in a \(\mathrm{Zn}\) casing which encloses a Carbon rod surrounded by black \(\mathrm{MnO}_2\) paste. What is the role of $$\mathrm{ZnCl...

Given below are 2 statements: Assertion and Reason. Choose the correct option.
Assertion: When Molar conductivity for a strong electrolyte is plotted versus \(\sqrt{C}(\mathrm{~mol} / \mathrm{L})^{1 / 2}\), a straight line is obtained with ...

Arrange the following redox couples in the increasing order of their reducing strength:
$$\begin{array}{ll}
{[\mathrm{A}]=\mathrm{Cu} / \mathrm{Cu}^{2+}} & \mathrm{E}^0=-0.34 \mathrm{~V} \\
{[\mathrm{~B}]=\mathrm{Ag} / \mathrm{Ag}^{+}} & \m...

A current of 3.0A is passed through 750 ml of 0.45 M solution of CuSO\(_4\) for 2 hours with a current efficiency of 90%. If the volume of the solution is assumed to remain constant, what would be the final molarity of CuSO\(_4\) solution?

What is the quantity of charge, in Faraday units, required for the reduction of 3.5 moles of \(\mathrm{Cr}_2 \mathrm{O} 7^{2-}\) in acid medium?

Identify the compound which is non-aromatic in nature.

Identify the final product formed when Toluene undergoes a series of reactions with reagents given in the order:
(i) \(\mathrm{Cl}_2\) / Sunlight
(ii) \(\mathrm{H}_2 \mathrm{O} / 373 \mathrm{~K}\)
(iii) Acetophenone / \(\mathrm{OH^-}\) at $...

Arrange the compounds \(\mathrm{A}, \mathrm{B}, \mathrm{C}\) and \(\mathrm{D}\) in the increasing order of their reactivity towards \(\mathrm{S_N}1\) reaction.
$$
\begin{aligned}
& \mathrm{A}=\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{...

Match the names of reactions given in Column I with the appropriate reactions given in Column II.

.tg {border-collapse:collapse;border-spacing:0;}
.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif...

Identify the products C, D and F formed in the following sets of reactions.

Arrange the following compounds in the increasing order of their reactivity when each of them is reacted with chloroethane / anhydrous AlCl\(_3\).

A Hydrocarbon [A] (molecular formula \(\mathrm{C}_3 \mathrm{H}_6\)) on reaction with \(\mathrm{Br}_2 / \mathrm{CCl}_4\) gave [B]. When [B] is heated with 2 moles of alcoholic \(\mathrm{KOH}\), it gave compound [C]. 3 moles of Compound [C] w...

Given below are 4 reactions. Two of these reactions will give product which is an equimolar mixture of the d and 1 forms. Identify these 2 reactions.
[A] 2- Methylpropene + \(\mathrm{HI} \rightarrow\) ---------
[B] But-1-ene + $$\mathrm{HB...

Identify the product \([\mathrm{C}]\) formed at the end of the reaction below
1,1,2,2- Tetrabromopropane + 2 \(\mathrm{Zn}_{(\mathrm{S})}\) / Ethanol \(\rightarrow\) [B]
\([\mathrm{B}]\) + 2 moles of \(\mathrm{HBr} \rightarrow[\mathrm{C}]\)

What volume of \(0.2 \mathrm{~M}\) Acetic acid is to be added to \(100 \mathrm{ml}\) of \(0.4 \mathrm{M}\) Sodium acetate so that a Buffer solution of \(\mathrm{pH}\) equal to 4.94 is obtained? \((\mathrm{pK}_{\mathrm{a}}\) of $$\mathrm{CH}...

A solute \(\mathrm{X}\) is found to exist as a dimer in water. A 4 molal solution of \(\mathrm{X}\) shows a boiling point of \(101.04^{\circ} \mathrm{C}\). What is the percentage association of \(\mathrm{X}\) ? (\(\mathrm{K}_{\mathrm{b}}\) ...

\(200 \mathrm{ml}\) of an aqueous solution contains \(3.6 \mathrm{~g}\) of Glucose and \(1.2 \mathrm{~g}\) of Urea maintained at a temperature equal to \(27^{\circ} \mathrm{C}\). What is the Osmotic pressure of the solution in atmosphere un...