Home
Class 11
CHEMISTRY
Assertion: The second substituent may en...

Assertion: The second substituent may enter the mono-substituted benzene ring at either ortho, para or at meta position.
Reason: The position of the incoming group is determined by the natrue fo the group present in monosubstituted benzene ring.

A

If both assertion and reson are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the assertion-reason question, we will analyze both the assertion and the reason step by step. ### Step 1: Understand the Assertion The assertion states that "the second substituent may enter the mono-substituted benzene ring at either ortho, para, or at meta position." This means that when a benzene ring already has one substituent, a second substituent can attach to the ring at three possible positions: ortho (adjacent to the first substituent), para (opposite the first substituent), or meta (one position away from the first substituent). **Hint:** Consider the structure of benzene and the positions available for substitution. ### Step 2: Understand the Reason The reason states that "the position of the incoming group is determined by the nature of the group present in the mono-substituted benzene ring." This implies that the type of substituent already on the benzene ring (whether it is an electron-donating group or an electron-withdrawing group) influences where the second substituent can attach. **Hint:** Recall the effects of electron-donating and electron-withdrawing groups on the electron density of the benzene ring. ### Step 3: Analyze Electron-Drawing and Electron-Donating Groups - **Electron-Donating Groups (EDGs):** These groups increase the electron density at the ortho and para positions, making these positions more favorable for electrophilic attack. Thus, if the first substituent is an EDG, the second substituent is likely to enter at the ortho or para position. - **Electron-Withdrawing Groups (EWGs):** These groups decrease the electron density at the ortho and para positions, making the meta position more favorable for electrophilic attack. Therefore, if the first substituent is an EWG, the second substituent is likely to enter at the meta position. **Hint:** Think about how the nature of the first substituent affects the reactivity of the benzene ring. ### Step 4: Conclusion Based on the analysis: - The assertion is correct because the second substituent can indeed enter at ortho, para, or meta positions. - The reason is also correct because the position of the incoming group is determined by the nature of the group already present on the benzene ring. Thus, both the assertion and reason are correct, and the reason correctly explains the assertion. **Final Answer:** Both the assertion and reason are correct, and the reason explains the assertion.
To solve the assertion-reason question, we will analyze both the assertion and the reason step by step. ### Step 1: Understand the Assertion The assertion states that "the second substituent may enter the mono-substituted benzene ring at either ortho, para, or at meta position." This means that when a benzene ring already has one substituent, a second substituent can attach to the ring at three possible positions: ortho (adjacent to the first substituent), para (opposite the first substituent), or meta (one position away from the first substituent). **Hint:** Consider the structure of benzene and the positions available for substitution. ### Step 2: Understand the Reason ...
Promotional Banner

Topper's Solved these Questions

  • HYDROCARBONS

    NCERT FINGERTIPS ENGLISH|Exercise Alkanes|25 Videos

  • HYDROCARBONS

    NCERT FINGERTIPS ENGLISH|Exercise Alkenes|25 Videos

  • HYDROCARBONS

    NCERT FINGERTIPS ENGLISH|Exercise Higher Order Thinkin Skills|7 Videos

  • EQUILIBRIUM

    NCERT FINGERTIPS ENGLISH|Exercise Assertion And Reason|15 Videos

  • HYDROGEN

    NCERT FINGERTIPS ENGLISH|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

Explain the orientation of-COOH group, when present on benzene ring.

Alkoxy group attached to benzene ring is ortho and para directing. Justify.

True or False? An electron donating substituent in benzene orients the incoming electrophilic group to the meta-position.

Assertion: In monohaloarenes, further electrophilic substitution occurs at ortho and para position Reason: Halogen atom is a ring deactivator

The most deactivating group for electrophilic substitution reaction in benzene ring is

Which of the following groups is o-p directing but deactivates benzene ring for electrophilic substitution?

The general electrophilic substitution reaction (replacement of H. by an electrophilic which is an electron deficient species) in aromatic ring is represented as followed. An electrophilic attacks on ortho and para positions which respect to a stronger +m group are present in benzene ring and the electrophilie attacks at meta position with respect to stronger -m group if two -m groups are present in benzene ring. What will be the product when electrophile Br^(o+) attacks on

The general electrophilic substitution reaction (replacement of H. by an electrophilic which is an electron deficient species) in aromatic ring is represented as followed. An electrophilic attacks on ortho and para positions which respect to a stronger +m group are present in benzene ring and the electrophilie attacks at meta position with respect to stronger -m group if two -m groups are present in benzene ring. The product of the following reaction is

It is not always easy to predict the position of attack on multiply substituted benzene. If the benzene ring bears different ortho//para directing group at the 1 and 4 positions, the position of further substitution is not immediately clear. Sometimes steric effects determine the outcome. In other cases, electronic factors determine the outcome, and further reaction will be at the position activated by the more strongly activating group. Some substituens are so strongly activating that no catalyst is needed, and it is often diffcult to stop substitution after mono substituion. Mild condition are needed to restrict the reaction to mono-substitution. It is possible to reduce the activity such groups by side chain reaction so that the reaction can be stopped use can sometimes be made of removable blocking groups on the ring. Which of the following synthesis could be done in the ring step ?

It is not always easy to predict the position of attack on multiply substituted benzene. If the benzene ring bears different ortho//para directing group at the 1 and 4 positions, the position of further substitution is not immediately clear. Sometimes steric effects determine the outcome. In other cases, electronic factors determine the outcome, and further reaction will be at the position activated by the more strongly activating group. Some substituens are so strongly activating that no catalyst is needed, and it is often diffcult to stop substitution after mono substituion. Mild condition are needed to restrict the reaction to mono-substitution. It is possible to reduce the activity such groups by side chain reaction so that the reaction can be stopped use can sometimes be made of removable blocking groups on the ring. Which of the following side reaction//s can be used to reduce the activity of strongly activating groups like -OH ?