COMEDK 2024 Morning Shift

Match the compounds given in column I with the corresponding most stable Carbocations formed by each, as given in Column II, when they undergo acidic dehydration in presence of Conc. \(\mathrm{H}_2 \mathrm{SO}_4\).

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An organic compound \([\mathrm{A}]\left(\mathrm{C}_5 \mathrm{H}_{12} \mathrm{O}\right)\), on reaction with conc. \(\mathrm{H}_2 \mathrm{SO}_4\) at \(443 \mathrm{~K}\) gives \([\mathrm{B}]\) as one of the products. Compound [B] undergoes fur...

A Carbonyl compound \(\mathrm{X}\) when reacted with Methyl magnesium bromide followed by hydrolysis gave product \(\mathrm{Y}\). When \(\mathrm{Y}\) is heated with \(\mathrm{Cu}\) at \(573 \mathrm{~K}\), it gave \(\mathrm{Z}\) (2- Methylbu...

Which one of the following statements is incorrect regarding acetal and ketal formation when Propanal and Propanone are separately reacted with Ethanol in presence of anhydrous \(\mathrm{HCl}\) gas.

Identify the Reagents I and II to be used in the course of the given reactions.

\(\text { Identify }[\mathrm{B}] \text { and }[\mathrm{C}] \text { formed in the reactions given below. }\)

Given below are 4 subatomic particles travelling with the same velocity "v". Which of them will have the shortest wavelength?
\([A]=\text { Proton }[B]=\text { Neutron. }[C]=\text { Alpha particle. }[D]=\text { Electron. }\)

The mass number of an element \(\mathrm{X}\) is 175 with 104 neutrons in its nucleus. Into which one of the following orbitals will the last electron enter?

A statement of Assertion followed by a statement of Reason is given.
Choose the correct answer out of the following options.
Assertion : Energy of \(2 \mathrm{~s}\) orbital of Hydrogen is less than the energy of the \(2 \mathrm{~s}\) orbita...

Match the Hormones listed in Column I with their characteristics listed in Column II

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Given below are 4 statements about Insulin. Which of these statement/(s) is/are correct?
[A] Insulin is a globular protein consisting of 51 Amino acids.
[B] Insulin is constituted of 3 polypeptide chains linked together.
[C] Insulin is cons...

Identify the 2 chemical tests which is not answered by Glucose having an open chain structure
[A] Reaction with Schiff's reagent and with Sodium bisulphite
[B] Reaction with \(\mathrm{HCN}\) and with \(\mathrm{HI}\)
[C] Reaction with $$\mat...

A sweet smelling organic compound \([\mathrm{A}]\left(\mathrm{C}_9 \mathrm{H}_{10} \mathrm{O}_2\right)\) undergoes acid hydrolysis to form an acid [B].
Compound [B] further reacts with Ammonia followed by heating to yield [C].
Compound $$...

Identify the product [D] formed when Reactant [A] \((M M 78 \mathrm{~g} / \mathrm{mol})\) undergoes the series of reactions shown

Given below are 4 molecular species/ions. Identify the species/ion which exhibits diamagnetic nature.
\([\mathrm{A}]=\mathrm{N}_2^{+} \quad[\mathrm{B}]=\mathrm{O}_2^{-} \quad[\mathrm{C}]=\mathrm{B}_2 \quad[\mathrm{D}]=\mathrm{C}_2\)

Identify the pair of molecules, both of which have positive values of Dipole moment.

On the basis of VSEPR theory, match the molecules listed in Column I with their shapes given in Column II.

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The time required for \(80 \%\) of a first order reaction is "\(y\)" times the half-life period of the same reaction. What is the value of "\(y\)"?

For the reaction \(\mathrm{Cl}_{2(\mathrm{~g})}+2 \mathrm{NO}_{(\mathrm{g})} \rightarrow 2 \mathrm{NOCl}_{(\mathrm{g})}\), the following data was obtained:

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A given chemical reaction is represented by the following stoichiometric equation.
\(3 X+2 Y+\frac{5}{2} Z \rightarrow P_1+P_2+P_3\)
The rate of reaction can be expressed as _________.

The rate constant for the reaction \(\mathrm{A} \rightarrow \mathrm{B}+\mathrm{C}\) at \(500 \mathrm{~K}\) is given as \(0.004 \mathrm{~s}^{-1}\). At what temperature will the rate constant become \(0.014 \mathrm{~s}^{-1}\) ? $$\mathrm{E}_{...

Given below are 4 graphs [A], [B], [C] and [D]

Identify the 2 graphs that represent a Zero order reaction?

Which one of the following shows the correct increasing order of basic nature of the given compounds?
A: Phenylmethanamine
B: N-Ethylethanamine
C:N, N-Dimethylaniline
D : N, N-Dimethylmethanamine

Aniline undergoes reactions with reagents given in the order shown
(i) Aqueous \(\mathrm{Br}_2\)
(ii) \(\mathrm{NaNO}_2 / \mathrm{HCl} / 0^0 \mathrm{C}\)
(iii) Hypophosphorous acid
What is the product formed at the end of these reactions?

What is the final product formed when Toluene undergoes the following series of reactions?

A d - block metal \(\mathrm{X}(\mathrm{Z}=26)\) forms a compound \([\mathrm{X}(\mathrm{CN})_2(\mathrm{CO})_4]^{+}\). Calculate its spin magnetic moment value.

Choose the incorrect statement from the following.

A Coordination compound is represented by the formula \([\mathrm{CoBr}_3(e n) x]\). This compound required one mole of \(\mathrm{AgNO}_3\) to form a pale yellow precipitate of \(\mathrm{AgBr}\). What is the value of \(\mathrm{x}\) in the co...

Choose the incorrect statement from the following

Match the compounds given in Column I with their characteristic features listed in Column II

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Arrange the following ions in the increasing order of their \(\Delta H_{(\text {hydration})}\) values.
\(\mathrm{Cr}^{2+}, \mathrm{Co}^{2+}, \mathrm{Mn}^{2+}, \mathrm{Ni}^{2+}\)

The permanganate ion in acid medium acts as an oxidant and gets converted to its lower oxidation state. What would be the spin only magnetic moment of such reduced manganese ion?

\(0.1 \mathrm{M}\) solution of \(\mathrm{AgNO}_3\) is taken in a Conductivity cell and a potential difference of \(40 \mathrm{~V}\) is applied across the ends of a column of this solution whose diameter is \(4.0 \mathrm{~cm}\) and length of...

Propane in presence of \(\mathrm{O}_2\) gas undergoes complete combustion to produce \(\mathrm{CO}_2\) and \(\mathrm{H}_2 \mathrm{O}\). The required \(\mathrm{O}_2\) for this combustion reaction was produced by the electrolysis of water. Fo...

Match the chemical reactions taking place at the Anode of the cell with the correct cell in which the reaction occurs.

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What would be the EMF of the cell in which the following reaction occurs:
$$\begin{aligned}
& \mathrm{Cd}(\mathrm{S})+2 \mathrm{H}^{+} \rightarrow \mathrm{Cd}^{2+}+\mathrm{H}_{2(\mathrm{~g})} \\
& {\left[\mathrm{H}^{+}\right]=0.02 \mathrm{M...

Given below are 4 equations showing Molar conductivities at infinite dilution of various electrolytes. Which one of them represents the correct equation?
$$\begin{aligned}
& \left(\Lambda_m^0\right)_{N a B r}-\left(\Lambda_m^0\right)_{N a C...

Given below are 4 species with one odd electron on the Carbon atom.
$$\begin{array}{ll}
\mathrm{A}=\left(\mathrm{CH}_3\right)_3 \stackrel{\bullet}{\mathrm{C}} & \mathrm{B}=\left(\mathrm{C}_6 \mathrm{H}_5\right)_3 \stackrel{\bullet}{\mathrm{...

Arrange the following compounds in the decreasing order of reactivity towards \(\mathrm{S}_{\mathrm{N}} 1\) reaction.

From the following compounds, identify the one which is most acidic.

Which one of the following compounds when reacted with \(\mathrm{NaOH}\) (aq) undergoes Substitution Nucleophilic Bimolecular reaction with retention of configuration?

An unsaturated hydrocarbon \([\mathrm{A}]\) reacts with \(\mathrm{HBr}\) in presence of Benzoyl peroxide to yield [B]
Compound [A] when reacted with cold, dilute alkaline \(\mathrm{KMnO}_4\) gave compound [C], 2-Methylbutane-2, 3-diol But w...

An aromatic hydrocarbon \([\mathrm{A}]\left(\mathrm{Molecular}\right.\) formula \(\left.\mathrm{C}_9 \mathrm{H}_{12}\right)\), undergoes air oxidation followed by reaction with dil.
\(\mathrm{HCl}\) to give [B] as one of the products
Compou...

\(300 \mathrm{ml}\) of an aqueous solution of \(\mathrm{NaOH}\) with \(\mathrm{pH}\) value of 10 is mixed with \(200 \mathrm{ml}\) of an aqueous solution of \(\mathrm{HCl}\) with a \(\mathrm{pH}\) value of 4. What will be the $$\mathrm{pH}$...

\(\mathrm{A}_3 \mathrm{~B}_4\) is a sparingly soluble salt with a solubility of \(\mathrm{s} g / \mathrm{L}\). If the Molar mass of \(\mathrm{A}_3 \mathrm{~B}_4\) is \(\mathrm{Mg} / \mathrm{mol}\), what is the expression for its $$\mathrm{K...

A statement of Assertion followed by a statement of Reason is given. Choose the correct answer out of the following options.
Assertion: The Eclipsed and the Staggered conformations of Ethane continuously flip from one form to the other.
Re...

Which one of the following compounds shows Geometrical isomerism?

What is the number of mono-chloro derivatives of Ethyl cyclohexane possible?

Which one of the following is the correct IUPAC name of the given compound?

\(\text { If a compound } \mathrm{X}_3 \mathrm{Y} \text { is } 60 \% \text { ionised in aqueous medium, what is its van't Hoff factor value? }\)