COMEDK 2026 Afternoon Shift

Two statements $[A]$ and $[B]$ are given below. Choose the correct option.
A) Protonated $\mathrm{R}-\mathrm{C} \mathrm{H}_2-\mathrm{OH}$ can serve as Electrophiles while neutral $\mathrm{R}-\mathrm{OH}$ acts as a Nucleophile.
B) The bond b...

Choose the incorrect statement.

\(\text { Identify the correct structure of o-ethyl anisole. }\)

\(\text { A compound }[X] \text { undergoes reactions as given. Identify compounds }[C] \text { and }[D] \text { formed in these reactions. }\)

\([\mathrm{A}] \xrightarrow{\mathrm{Cr}_2 \mathrm{O}_7^{2-} / \mathrm{H}^{+}}[\mathrm{C}]\)...

\(\text { Match the reactions in List I with the final products formed as given in List II. }\)
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Choose the correct reason:
o-hydroxybenzaldehyde is a liquid at room temperature while $p$-hydroxy-benzaldehyde is a high melting solid, because

Which one of the following is the correct statement?

\(\text { Consider the series of reactions given and identify the final product [Z]. }\)
\([X] \xrightarrow{\mathrm{CrO}_3}[Y] \quad \xrightarrow[\text { (ii) } \mathrm{H}_2 \mathrm{O}]{\text { (i) } \mathrm{CH}_3 \mathrm{MgBr}}[Z]\)

$$ \begin{aligned} &\text { Identify products }\left[\mathbf{P}_{\mathbf{1}}\right] \text { and }\left[\mathbf{P}_{\mathbf{2}}\right] \text { formed when Benzonitrile undergoes the following reactions. }\\ &\text { Benzo nitrile } \xrightar...

\(\text { The product formed in the following reaction is: }\)

Which of the following statement is correct?

The frequency of photon which is emitted during a transition of electron of $\mathrm{He}^{+}$ion from fifth energy level to third energy level will be:

A small segment of a polypeptide gave on complete hydrolysis 3 molecules of alanine, 2 molecules of glycine and 3 molecules of cysteine. What is the number of peptide linkages in the segment of the polypeptide?

Identify the correct statement.

\(\text { Match the characteristic from Col. I with the Vitamins given in Col. II. }\)
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\(\text { Identify the reagents, }[A] \text { and }[B] \text { used up when Salicylic acid undergoes the following reactions: }\)

The number of bond pairs and lone pairs of electrons in the molecule $I F_5$ is:

According to Molecular orbital theory, which of the following is correct with respect to bond order?

An equilibrium mixture taken in 2 litre vessel of the reaction: $2 \mathrm{SO}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_3(\mathrm{~g})$ has 4 moles of $\mathrm{SO}_2, 3$ moles of $\mathrm{O}_2$ and 6 moles o...

A first order reaction is $50 \%$ complete in 30 minutes at 300 K and in 10 minutes at 320 K . The activation energy of the reaction ( $E_a$ ) is: $\left[R=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1} ; \log 2=0.3010 ; \log 3=0.477...

The initial pressure of the system before decomposition for a first order gas phase reaction $A_{(g)} \rightarrow B_{(g)}+C_{(g)}$ was $\mathrm{P}_{\mathrm{i}}$. After lapse of time ' t ', total pressure of the system increased by ' x ' uni...

Which of the following factors is altered by the addition of a catalyst during a chemical reaction?

\(\text { When the concentration of the reactant in a given reaction is halved and if the rate of reaction is halved, the order of the reaction is: }\)

In the synthesis of $\mathrm{NH}_3$ from $\mathrm{H}_2$ and $\mathrm{N}_2$, if $6 \times 10^{-2}$ mole of hydrogen disappears in 10 minutes, the number of moles of $\mathrm{NH}_3$ formed in 0.3 minutes is:

Choose the incorrect statement.

A Nitrogen containing organic compound with molecular formula $\mathrm{C}_3 \mathrm{H}_5 \mathrm{~N}$ undergoes the following reactions.
$$ \begin{aligned} & \mathrm{C}_3 \mathrm{H}_5 \mathrm{~N}+\mathrm{Na} / \mathrm{Hg} \text { in } \math...

Identify the final product formed when benzenamine reacts with the given reagents in the sequential order as:
i. $\quad\left(\mathrm{CH}_3-\mathrm{CO}\right)_2 \mathrm{O} /$ Pyridine.
ii.      Conc. $\mathrm{HNO}_3+\mathrm{H}_2 \mathrm{SO}_...

Identify the complex which exhibits all 3 characteristics; paramagnetic; high spin configuration; octahedral geometry

Which one of the following complex-isomerism pair matches correctly?

The product and its colour when $\mathrm{MnO}_2$ is fused with KOH in presence of $\mathrm{O}_2$ :

The element with the highest third ionisation enthalpy is:

Which of the following does not correctly represent the order of the property indicated against it?

Pick out the correct option
Assertion(A): Mercury is not considered as a transition element
Reason (R): Mercury is a liquid

$$ \begin{aligned} &\text { Using the data given below, the strongest reducing agent is: }\\ &\begin{array}{ll} \mathrm{E}_{\mathrm{Cr}_2 \mathrm{O}_7}^{\mathrm{o}}{ }^{2-} / \mathrm{Cr}^{3+}=1.33 \mathrm{~V} & \mathrm{E}_{\mathrm{MnO}_4^{-...

The quantity of Ca that can be produced from molten $\mathrm{CaCl}_2$, with the same quantity of electricity (in coulombs) required to produce 4.8 g of Mg from molten $\mathrm{MgCl}_2$ is: [Atomic mass of $\mathrm{Mg}=24 \mathrm{u}$; Atomic...

The $\Delta \mathrm{G}^{\circ}$ for the reaction, $C d^{2+}(a q)+Z n(s) \rightarrow Z n^{2+}(a q)+C d(s)$ is: $\left[E_{C d^{2+} / C d}^o=-0.403, E_{Z n^{2+} / Z n}^o=-0.763 \mathrm{~V}\right]$

Resistance of 0.2 M solution of an electrolyte is $50 \Omega$. The conductivity of the solution is $1.3 \mathrm{Sm}^{-1}$. If the resistance of 0.4 M solution of the same electrolyte is $260 \Omega$, its molar conductivity is:

Which of the following is always true about a spontaneous cell reaction in a galvanic cell?

Which of the following is an INCORRECT statement?

\(\text { Identify the aromatic compounds among the given set based on Huckel's rule: }\)

\(\text { Among the given resonating structures of molecules negative mesomeric effect is represented by: }\)

\(\text { What is the major product }[Z] \text { formed when compound }[C] \text { undergoes the following reactions: }\)

With reference to the two statements Assertion and Reason, choose the correct option.
Assertion: The order of reactivity towards $\mathrm{S}_{\mathrm{N}} 1$ reaction is: $\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}_2 \mathrm{Br}>\left(\mathrm{CH}...

Arrange the given alkanes in increasing order of their boiling points.
(A) 2, 2-dimethylpropane
(B) 2-methylbutane
(C) n-pentane
(D) n-butane

The statements given below contains assertion and reason. Choose the correct option
Assertion (A): Propene reacts with HBr in presence of organic peroxide gives 1-bromopropane.
Reason(R): The reaction occurs through carbocation intermediate...

An unsaturated organic compound $\left(\mathrm{C}_3 \mathrm{H}_6\right)$, undergoes the following series of reactions:
Identify compound [D]

$$ \begin{aligned} &\text { What is the major product }\left[\mathrm{P}_3\right] \text { formed when } n \text { - Hexane undergoes the given series of reactions: }\\ &\begin{aligned} \text { n-Hexane } & \frac{\mathrm{V}_2 \mathrm{O}_5}{20...

At $30^{\circ} \mathrm{C}$ the solubility of $\mathrm{PbI}_2$ salt in 0.2 M KI solution will be $X$, if the solubility product of $\mathrm{PbI}_2$ at $30^{\circ} \mathrm{C}$ is $2.4 \times 10^{-8}$. Identify the value of $X$.

When 1 mole of benzene is mixed with 1 mole of toluene, the vapours will contain

The system that forms maximum boiling azeotrope is: