1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two statements, One Assertion (A) and the other Reason (R) are given. Choose the right option.

Assertion: The rate constant $(\mathrm{k})$ for a chemical reaction gets nearly doubled for a $10^0$ rise in temperature.

Reason: The number of bimolecular collisions between reactant molecules increase with increase in temperature

A
A is correct but R is wrong.
B
Both A and R are correct but R is not the correct explanation of A .
C
Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$.
D
A is wrong but R is correct.
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Which one of the following is a true statement with reference to reaction between 2- Bromo-2-methylpropane and aqueous KOH ?
A
The rate of reaction depends on the concentration of the haloalkane and the nucleophile $\mathrm{OH}^{-}$
B
The reaction occurs at a fast rate since the substrate is a tertiary alkyl halide and follows $\mathrm{S}_{\mathrm{N}} 1$ mechanism.
C
The reaction is not favoured by the presence of polar protic solvent.
D
The reaction occurs at a slow rate since it follows $\mathrm{S}_{\mathrm{N}} 2$ mechanism.
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Which of the following haloalkanes will give more than one isomeric product, on being heated with alc. KOH ?
A
1- Chloro-2-methylbutane
B
1-Chloropentane.
C
2-Chloro-3, 3-dimethylpentane
D
2- Chlorobutane.
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Which one of the following coordination compounds will exhibit both geometrical and optical isomerism?
A
$\left[\operatorname{Cr}(\mathrm{ox})_3\right]^{3-}$
B
$\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+}$
C
$[\mathrm{Co}(\mathrm{CN}) 6]^{3-}$
D
$\left[\mathrm{Co}\left(\mathrm{NO}_3\right)_3\left(\mathrm{NH}_3\right)_3\right]$
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