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The image below shows different benzene ...

The image below shows different benzene derivates that give mononitration product at ortho, meta and para positions along with the rate of nitration relative to benzene.

Which of the following row shows atleast one INCORRECT description about the reaction?

A

only B

B

only C

C

only B and C

D

only C and D

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It is not always easy to predict the position of attack on multiply substituted benzene. If the benzene ring bears different group ortho/ para di- recting group at the 1 and 4 positions, the position of further substitution is not immediately clear. Which of the following side chain reaction/s can be used to reduce the activity of strongly activat- ing groups like – OH

The diagram below shows an instantaneous position of a string as a transverse progressive wave travels along it from left to right Which one of the following correctly shows the direction of the velocity of the points 1,2 and 3 on the string?

Identification of +m & -m groups : If the first atom of the group has lone pair or negative charge shows +m effect. +m group increases electron density at ortho and para position of benzene ring. If the group has vacant p- orbital on first atom, also a multipal bonded group in which second atom is more electronegative than the first then it shows -m effect. -m group decreases electron density of ortho and para position of benzene ring. Identify which of following group/s show -m effect when attached with benzene ring.

Identification of +m & -m groups : If the first atom of the group has lone pair or negative charge shows +m effect. +m group increases electron density at ortho and para position of benzene ring. If the group has vacant p- orbital on first atom, also a multipal bonded group in which second atom is more electronegative than the first then it shows -m effect. -m group decreases electron density of ortho and para position of benzene ring. Which of the following compound/s have more electron density than

Benzene ring in aniline is highly activated. This is due to the sharing of lone pair of nitrogen with the ring which results in increase in the electron density on the ring and hence facilitates the electrophilic attack. The substitution mainly takes place at ortho and para positions because electron density is more at ortho and para positions. On reaction with aqueous bromine all the ortho and para positions get substituted resulting in the formation of 2,4,6-tribromoaniline. To get a monobromo compound, the amino group is acetylated before bromination. After bromination, the bromoacetanilide is acid hydrolysed to give the desired halogenated amine. In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices: Assertion (A): Benzene ring is aniline is highly deactivated. Reason (R): In aniline, the sharing of lone pair of nitrogen with the ring increases the electron density on the ring.

Benzene ring in aniline is highly activated. This is due to the sharing of lone pair of nitrogen with the ring which results in increase in the electron density on the ring and hence facilitates the electrophilic attack. The substitution mainly takes place at ortho and para positions because electron density is more at ortho and para positions. On reaction with aqueous bromine all the ortho and para positions get substituted resulting in the formation of 2,4,6-tribromoaniline. To get a monobromo compound, the amino group is acetylated before bromination. After bromination, the bromoacetanilide is acid hydrolysed to give the desired halogenated amine. In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices: Assertion (A): In aniline -NH2 group facilitates the electrophilic attack. Reason (R): It is due to decrease in electron density on the ring.

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