COMEDK 2023 Evening Shift

Identify the starting compound from the following data:
\(\mathrm{C}_6 \mathrm{H}_{14} \mathrm{O}(\mathrm{X})\) on reaction with \(\mathrm{HI}\) yields a haloalkane (A) and an alcohol (B). Compound (A) on reaction with aqueous $$\mathrm{NaO...

Choose the correct order of increasing acidic strength of the following compounds.

Choose the incorrect statement.

Which one of the following compounds would not undergo Aldol condensation?

From among the following, identify the compound which forms two moles of a ketone on ozonolysis.
[A] 2,3-Dimethylbutane.
[B] 3-Methyl-1-pentene.
[C] 2,3-Dimethyl-2-butene.
[D] 2-Methyl-2-pentane.

What would be the products obtained when a mixture of p-Methoxy benzaldehyde and Methanal are heated with \(50 \%\) concentrated Caustic soda solution?

Identify the final product formed during the course of the given reactions.
Pentan-2-one \(\xrightarrow{\mathrm{NaCN} / \mathrm{HCl}}[\mathrm{X}]\)
\([\mathrm{X}] \xrightarrow[95 \% \mathrm{H}_3 \mathrm{PO}_4]{\Delta \text { with }}[Y]\)

A proton having mass equal to \(1.66 \times 10^{-27} \mathrm{~kg}\) is accelerated to one tenth of the velocity of light. If its velocity can be measured to an accuracy of \(\pm 2 \%\), what would be the uncertainty in its position?

The energy of an electron in the ground state of Hydrogen atom is \(-2.18 \times 10^{-18} \mathrm{~J}\). What would be the energy associated with the second excited state of \(\mathrm{Li}\) ?

One among the 4 Vitamins belonging to \(\mathrm{B}\) Complex, can be stored in our body. Identify the Vitamin.

Choose the incorrect statement regarding Cellulose.

Which one of the following correctly represents the decreasing order of acidic nature of the given carboxylic acids:
[A] 2-Hydroxybenzoic acid
[B] Benzoic acid
[C] 3-Hydroxybenzoic acid
[D] 4- Hydroxybenzoic acid

Identify the correct statement describing the characteristics of \(\mathrm{C}_2\) molecule.

Arrange the following in the decreasing order of their Dipole moments.
a. Chlorobenzene
b. 1,2-Dichlorobenzene
c. 1,3-Dichlorobenzene
d. 1,4-Dichlorobenzene.

In the following question, Assertion (A) is given followed by a statement of Reason (R). Choose the correct answer.
Assertion (A): \(\pi\left(2 p_x\right), \pi\left(2 p_y\right), \pi^*\left(2 p_x\right), \pi^*\left(2 p_y\right)\) molecular ...

The equilibrium constants for the reactions \(a, b\), and \(c\) are as given:
a) \(\mathrm{N}_2+3 \mathrm{H}_2=2 \mathrm{NH}_3: \mathbf{K}_1\)
b) \(\mathrm{N}_2+\mathrm{O}_2=2 \mathrm{NO}: \mathrm{K}_2\)
c) $$2 \mathrm{H}_2+\mathrm{O}_2=2 \...

A first order reaction proceeds to \(90 \%\) completion. What will be the approximate time taken for \(90 \%\) completion in relation to \(t_{1 / 2}\) of the reaction?

For a reaction of the type, \(2 \mathrm{X}+\mathrm{Y} \rightarrow \mathrm{A}+\mathrm{B}\), the following is the data collected:

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The rate constant for a First order reaction at \(560 \mathrm{~K}\) is \(1.5 \times 10^{-6}\) per second. If the reaction is allowed to take place for 20 hours, what percentage of the initial concentration would have converted to products?

Match the details given in Column I with those given in Column II

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Given below are graphs showing the variation in velocity constant with temperature on Kelvin scale. Identify the graph which represents Arrhenius equation.

Which one of the following will give a positive result when it is warmed with Chloroform and alcoholic solution of \(\mathrm{KOH}\) ?

What would be the final product [\(\mathbf{X}\)] formed when p-Toluidine undergoes the following series of reactions?
$$\begin{aligned}
& \text { P-Toluidine } \xrightarrow[\text { Pyridine }]{\left\{\mathrm{CH}_2, \mathrm{CO}_2 \mathrm{O}\...

Identify the correct IUPAC name of \([\mathrm{CoCl}_2(\mathrm{NO}_2)(\mathrm{NH}_3)_3]\)

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

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Which one of the following is an incorrect statement pertaining to the properties of Coordination compounds?

Which one of the following Coordination entities exhibits Facial and Meridional isomerism?

Match the following characteristics of transition metals given in Column I with the examples listed in Column II

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Find the correct matches of the substances, given in Column I, from their characteristic properties given in Column II.

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Identify the incorrect statement.

The Molar conductivity of \(0.05 \mathrm{M}\) solution of \(\mathrm{MgCl}_2\) is \(194.5 \mathrm{~ohm}^{-1} \mathrm{~cm}^2\) per mole at room temperature. A Conductivity cell with electrodes having \(3.0 \mathrm{~cm}^2\) surface area and $$...

If electrolysis of water is carried out for a time duration of 2 hours, how much electric current in amperes would be required to liberate \(100 \mathrm{~ml}\) of \(\mathrm{O}_2\) gas measured under standard conditions of temperature and pr...

When Lead Storage battery is in the process of getting charged which one of the following reactions takes place?

Match the items in Column I with their description in Column II

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The reaction taking place in a galvanic cell is as given
$$\mathrm{A}(\mathrm{s})+\mathrm{B}^{2+}\left(\mathbf{1} \mathbf{1} \mathbf{1 0} \mathbf{0}^{-\mathrm{M}} \mathbf{M}\right) \rightarrow \mathrm{B}_{(\mathrm{s})}+\mathrm{A}^{2+}(0.1 \...

Select the strongest base from the given compounds:
[A] p- \(\mathrm{NO}_2-\mathrm{C}_6 \mathrm{H}_4 \mathrm{NH}_2\)
[B] \(\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}_2-\mathrm{NH}_2\)
[C] $$\mathrm{m}-\mathrm{NO}_2-\mathrm{C}_6 \mathrm{H}_4 \mat...

Which one of the following statements is correct?

The reactions taking place with \(\mathrm{2- Phenyl-2-bromopropane}\) as the starting material is shown below. Identify [A] and [B] formed in the reaction.
$$
\mathrm{C}_6 \mathrm{H}_5-\mathrm{C}\left(\mathrm{CH}_3\right)_2^{-} \mathrm{Br} ...

Which one of the following will undergo Nucleophilic substitution, by \(\mathrm{S}_{\mathrm{N}}{ }^1\) mechanism, fastest?

Identify the compounds A, B, C and D.
\(\text { 1,2,2,2-tetrachloroethane } \xrightarrow[\Delta]{\mathrm{Zn}}[\mathrm{A}]\)
[A] \(\xrightarrow[675 \mathrm{~K}]{\text { Fe tube }}\) [B] $$
\xrightarrow[\text { Conc. } \mathrm{H}_2 \mathr...

The conversion of Propyne to Benzene can be brought out in 4 steps.
Choose the reagents to be used, in the proper sequential order, to bring out the conversion.
Reagents provided: alc. $$\mathrm{KOH}, \mathrm{H}_2 / \mathrm{Pd}, \mathrm{Na}...

Identify the reagents \(\mathrm{X}, \mathrm{Y}\) and \(\mathrm{Z}\) used to bring out the following reactions.

What would be the volume of water required to dissolve \(0.2 \mathrm{~g}\) of \(\mathrm{PbCl}_2\) of molar mass \(278 \mathrm{~g} / \mathrm{mol}\) to prepare a saturated solution of the salt? \((\mathrm{K}_{\mathrm{SP}}\) of $$\mathrm{PbCl}...

Which of the following will show geometrical isomerism?

Structures of 3 Monosaccharides are given below. Two of them are Anomers. Identify the two Anomers.

What would be the van't Hoff factor for a solution prepared by dissolving \(3.42 \mathrm{~g}\) of \(\mathrm{CaCl}_2\) in \(2500 \mathrm{~ml}\) of water having an Osmotic pressure equal to \(0.75 \mathrm{~atm}\). at \(27^{\circ} \mathrm{C}\)...

What is the mole fraction of solute in a \(5 \mathrm{~m}\) aqueous solution?

\(\mathrm{X}\) is an electrolyte with a concentration of \(0.04 \mathrm{M}\) whose formula is of the type \(\mathrm{X}_2 \mathrm{~A}\). \(\mathrm{Y}\) is a non-electrolyte solution with a concentration of \(0.2 \mathrm{M}\) and has an osmot...

Choose the incorrect statement:

If the depression in freezing point of an aqueous solution containing a solute, which is neither dissociated nor associated, is \(\mathbf{a} \mathrm{K}\) with \(\mathrm{K}_{\mathrm{f}}=\mathbf{b ~ K ~ k g ~ m o l}{ }^{-1}\), what would be t...