7
MCQ (Single Correct Answer)
During hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. According to you which technique can give the best results?
A
Column chromatography
B
Solvent extraction
C
Distillation
D
Thin layer chromatography
8
MCQ (Single Correct Answer)
The principle involved in paper chromatography is
A
adsorption
B
partition
C
solubility
D
volatility
9
MCQ (Single Correct Answer)
What is the correct order of decreasing stability of the following cations?
A
II > I > III
B
II > III > I
C
III > I > II
D
I > II > III
10
MCQ (Single Correct Answer)
Correct IUPAC name for
is ........... .
A
2-ethyl-3-methylpentane
B
3,4-dimethylhexane
C
2-sec-butylbutane
D
2, 3-dimethylbutane
11
MCQ (Single Correct Answer)
In which of the following compounds the carbon marked with asterisk is expected to have greatest positive charge?
A
${ }^* \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{Cl}$
B
${ }^* \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{Mg}^{+} \mathrm{Cl}^{-}$
C
$* \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{Br}$
D
$* \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_3$