1
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.
2
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.
3
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
$\left[\mathrm{Co}\left(\mathrm{NO}_3\right)_3\left(\mathrm{NH}_3\right)_3\right]$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The concentration and percentage purity of Oxalic acid can be determined by titration with $\mathrm{KMnO}_4$ in presence of dil. $\mathrm{H}_2 \mathrm{SO}_4$. Instead of dil. $\mathrm{H}_2 \mathrm{SO}_4$, dil HCl cannot be used because
A
HCl can also reduce $\mathrm{MnO}_4^{-}$to $\mathrm{Mn}^{2+}$
B
HCl can also provide $\mathrm{H}^{+}$ions in addition to $\mathrm{H}^{+}$ions from Oxalic acid.
C
HCl can also oxidise Oxalic acid to $\mathrm{CO}_2$ and $\mathrm{H}_2 \mathrm{O}$.
D
Oxalic acid oxidises HCl to $\mathrm{Cl}_2$.
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12