COMEDK 2026 Morning Shift

Which one of the following statements is wrong?

An aliphatic compound $[\mathrm{X}]$, Molecular formula $\left(\mathrm{C}_4 \mathrm{H}_{10} \mathrm{O}\right)$ can be prepared from Acetone and $\mathrm{R}-\mathrm{Mg}-\mathrm{X}$.
$[\mathrm{X}]$ with $20 \%$ Phosphoric acid gives an unsatu...

\(\text { Match reactions in Column I with the corresponding products formed as given in Column II. }\)
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\(\text { Identify X, Y and Z. }\)

Which of the following is NOT TRUE about nucleophilic addition reactions of aldehydes?

Etard reaction is a method of preparation of benzaldehyde by oxidation of toluene. The oxidizing agent used in this reaction is:

\(\text { Identify the compounds } \mathrm{A} \text { and } \mathrm{B} \text { from the following reaction sequence: }\)

Propanal on reaction with dilute NaOH , undergoes aldol condensation resulting in the formation of a compound A . identify the correct structure of A and name of the compound.

The Bohr orbit of the hydrogen atom ( $n=1$ ) is $0.530 \mathop {\rm{A}}\limits^{\rm{o}} $. The radius of the first excited state orbit in $\mathop {\rm{A}}\limits^{\rm{o}} $ is:

In the photoelectric emission, the energy of the emitted electron is:

Which among the following is an INCORRECT statement?

Which of the following is a correct match?

The secondary structure of protein consists of:

Identify the name of the reaction involved in conversion of $A \rightarrow B$ and name the compound $B$.
$$ \mathrm{CH}_3 \mathrm{CN} \xrightarrow[\mathrm{H}_2 \mathrm{O}]{\mathrm{H}^{+}} \mathrm{A}-\xrightarrow[\mathrm{H}^{+} / \mathrm{H}_...

Which of the following options represent the correct bond order?

The highest dipole moment is for:

The hybridisation of atomic orbitals of nitrogen in $\mathrm{NO}_2{ }^{+}, \mathrm{NO}_3{ }^{-}$and $\mathrm{NH}_4{ }^{+}$are respectively

If the equilibrium constant for $\mathrm{N}_{2(g)}+\mathrm{O}_{2(g)} \rightleftharpoons 2 \mathrm{NO}_{(g)}$ is 49 The equilibrium constant for the reaction $N O_{(g)} \rightleftharpoons \frac{1}{2} N_{2(g)}+\frac{1}{2} O_{2(g)}$ is $\_\_\_...

Consider the gaseous equilibrium
$2 \mathrm{AB}_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{AB}_{(\mathrm{g})}+\mathrm{B}_{2(\mathrm{~g})}$
The expression relating the degree of dissociation ( $\alpha$ ) and equilibrium constant ( $K_p$ )...

The rate constants for two different reactions, $\mathrm{k}_1$ and $\mathrm{k}_2$ are $10^{16} \cdot \mathrm{e}^{-2000 / \mathrm{T}}$ and $10^{15} \cdot \mathrm{e}^{-1000 / \mathrm{T}}$ respectively. The temperature at which $k_1=k_2$ is

Rate law can be determined from a balanced chemical equation if

$60 \%$ of a first order reaction was completed in 60 min , then $50 \%$ of the same reaction can be completed in: $[\log 4=0.60, \log 5=0.69]$

Identify the correct values to be plotted in the graph, the slope of which can be used to determine the activation energy of a reaction.

When the initial concentration of a zero order reaction is doubled, the half-life of the reaction is:

Which of the following is the correct reaction of Hinsberg's reagent with primary, secondary and tertiary amines?

The reagent used in carbylamine reaction is $\_\_\_\_$ and the product of the reaction will be $\_\_\_\_$

\(\text { Identify the correct order of the type of reactions taking place in this sequence: }\)

The Crystal Field Stabilisation energy of (i) $\left[\mathrm{CoF}_6\right]^{3-}$ and (ii) $\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ are ⋯and ⋯⋯ respectively.

\(\text { Match the Coordination compounds in Column I with the type of stereoisomerism given in Column II exhibited by them. }\)
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Which one of the following species will impart colour to an aqueous solution?

$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ on heating with aqueous NaOH gives $\_\_\_\_$

The statements given below contains assertion and reason. Choose the correct option
Assertion (A): Cr, Mo and W possess the highest melting point in their respective series of elements.
Reason (R): Cr, Mo and W have stable half-filled elect...

The basic character of transition metal monoxides follows the order:

The ion that has a spin only magnetic moment of 5.9 BM is:

What will be the change in the electrode potential of chromium electrode dipping into chromic sulphate solution, when the electrolyte is diluted 10 times at $25^{\circ} \mathrm{C}$ ? $\left[\mathrm{E}^0\left(\mathrm{Cr}^{3+} / \mathrm{Cr}\r...

Two statements, one Assertion and the other Reason are given. Choose the right option.
Assertion: The Molar conductivity of KCl increases very slowly with dilution and approaches a limiting value when dilution is infinite.
Reason: In case o...

$3.482 \times 10^{-1} \mathrm{~g}$ of Fe gets deposited when an aqueous solution of Ferric sulphate is electrolysed for 20 minutes using a current of " $x$ " amperes. Find " $x$ ". (Atomic mass of $\mathrm{Fe}=56 \mathrm{amu}$ ).

Identify the correct mathematical expression which represents the variation in molar conductivity of a weak acid having concentration C and ionisation constant $\mathrm{K}_{\mathrm{a}}$
( $\lambda_m^{\infty}=$ molar conductivity at infinite...

Consider a Galvanic cell in which the following reactions occurs: $\mathrm{Fe}^{2+}(\mathrm{aq})+\mathrm{Ag}^{+}(\mathrm{aq}) \rightarrow \mathrm{Fe}^{3+}(\mathrm{aq})+\mathrm{Ag}(\mathrm{s})$. What is the standard potential of the cell? Gi...

Select the reagents needed to convert Benzene to 4-Bromophenylpropene in the correct sequential order.
(A). $\mathrm{Cl}_2 / \Delta$
(B). $\left(\mathrm{CH}_3\right)_2-\mathrm{CHCl}$ /anhyd. $\mathrm{AlCl}_3$
(C). Alc. KOH
(D). $\mathrm{Br}...

Identify the wrong statement from the following

Two statements, Assertion and Reason are given. With reference to them, choose the correct option.
Assertion: Hydrolysis of 2-Bromo-2-methylpropane follows $S_N 1$ mechanism which involves 2 steps and the first step is:
Reason: The energy r...

A compound with molecular formula $\mathrm{C}_5 \mathrm{H}_{10}$ that gives acetone on ozonolysis is:

When 2-butyne is treated with dilute $\mathrm{H}_2 \mathrm{SO}_4 / \mathrm{HgSO}_4$, the product formed is:

\(\text { The decreasing order of reactivity towards electrophilic substitutions is: }\)

The number of structural isomers possible for a compound with molecular formula $\mathrm{C}_3 \mathrm{H}_9 \mathrm{~N}$ is:

\(\text { Which one of the following is not the correct IUPAC name of the compound? }\)

Identify the correct statement

What is the percentage dissociation of 0.8 ml of Acetic acid (density is $1.04 \mathrm{~g} / \mathrm{ml}$ ) which is dissolved in 1.2 L of water if the observed Depression in freezing point is 0.0228 K ? ( $\mathrm{K}_{\mathrm{f}}$ for wate...

0.02 M solution of sucrose is isotonic with 0.008 M solution of sodium sulphate. What is the percentage dissociation of the electrolyte?