15
MCQ (Multiple Correct Answer)
For an electrophilic substitution reaction, the presence of a halogen atom in the benzene ring ........... .
A
deactivates the ring by inductive effect
B
deactivates the ring by reasonance
C
increases the charge density at ortho and para position relative to meta position by resonance.
D
directs the incoming electrophile to meta position by increasing the charge density relative to ortho and para position.
16
MCQ (Multiple Correct Answer)
In an electrophilic substitution reaction of nitrobenzene, the presence of nitro group ......... .
A
deactivates the ring by inductive effect
B
activates the ring by inductive effect
C
decreases the charge density at ortho and para position of the ring relative to meta position by resonance
D
increases the charge density at meta position relative to the ortho and para positions of the ring by resonance
17
MCQ (Multiple Correct Answer)
Which of the following are correct?
A
$\mathrm{CH}_3-\mathrm{O}-\mathrm{CH}_2^{\oplus}$ is more stable than $\mathrm{CH}_3-\mathrm{CH}_2^{\oplus}$
B
$\left(\mathrm{CH}_3\right)_2 \mathrm{CH}^{\oplus}$ is less stable than $\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2^{\oplus}$
C
$\mathrm{CH}_2=\mathrm{CH}-\mathrm{CH}_2^{\oplus}$ is more stable than $\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2^{\oplus}$
D
$\mathrm{CH}_2=\mathrm{CH}^{\oplus}$ is more stable than $\mathrm{CH}_3-\mathrm{CH}_2^{\oplus}$
18
MCQ (Multiple Correct Answer)
Four structures are given in options (a) to (d). Examine them and select the aromatic structures.
A
B
C
D
19
MCQ (Multiple Correct Answer)
The molecules having dipole moment are ............. .
A
2,2-Dimethylpropane
B
trans-Pent-2-ene
C
cis-Hex-3-ene
D
2, 2, 3, 3 - Tetramethylbutane