18
MCQ (Multiple Correct Answer)
Electrophiles are electron seeking species. Which of the following groups contain only electrophiles?
A
$\mathrm{BF}_3, \mathrm{NH}_3, \mathrm{H}_2 \mathrm{O}$
B
$\mathrm{AlCl}_3, \mathrm{SO}_3, \mathrm{NO}_2^{+}$
C
$\mathrm{NO}_2^{+}, \mathrm{CH}_3^{+}, \mathrm{CH}_3-\mathrm{C}^{+}=\mathrm{O}$
D
$\mathrm{C}_2 \mathrm{H}_5^{-}, \dot{\mathrm{C}}_2 \mathrm{H}_5, \mathrm{C}_2 \mathrm{H}_5^{+}$
19
MCQ (Multiple Correct Answer)
Which of the following pairs are position isomers?
A
I and II
B
II and III
C
II and IV
D
III and IV
20
MCQ (Multiple Correct Answer)
Which of the following pairs are not functional group isomers?
A
II and III
B
II and IV
C
I and IV
D
I and II
21
MCQ (Multiple Correct Answer)
Nucleophile is a species that should have
A
a pair of electrons to donate
B
positive charge
C
negative charge
D
electron deficient species
22
MCQ (Multiple Correct Answer)
Hyperconjugation involves delocalisation of .......... .
A
electrons of carbon-hydrogen $\sigma$ bond of an alkyl group directly attached to an atom of unsaturated system.
B
electrons of carbon-hydrogen $\sigma$ bond of alkyl group directly attached to the positively charged carbon atom.
C
$\pi$-electrons of carbon-carbon bond
D
lone pair of electrons.