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Assertion : In strongly acidic solution,...

Assertion : In strongly acidic solution, aniline becomes less reactive towards electrophilic reagents .
Reason : Due to protonation of amino group the lone pair of electrons on nitrogen is not available for donation to benzene ring by resonance .

A

Both assertion and Reason are true and Reason is the correct explanation of Assertion.

B

Both Assertion and Reason are true and Reason are true but Reason is not correct explanation of Assertion.

C

Assertion is true but Reason is false.

D

Assertion is false but Reason is true.

Text Solution

Verified by Experts

The correct Answer is:
D
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Assertion : Alkynes are less reactive than alkenes towards electrophilic reagents Reason : General formula of alkenes is CnH2n-2 a.If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion. b.If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion. c. Assertion is CORRECT but Reason is INCORRECT. d.If Assertion is INCORRECT but Reason is CORRECT.

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The lone pair of amines makes them basic. They react with acids to form acid-base salts. Amines are more basic than alcohols, ethers and water. When an amine is dissolved in water, an equilibrium is established , where water acts as an acid and transfer a proton to the amine. The basic strength of an amine can be measured by basicity constant K_(b) . Arylamines are less basic than alkylamines because the lone pair of nitrogen is delocalised with the aromatic ring and are less available for donation. Substituted arylamines can be either more basic or less basic than aniline , depending on the substituted . ERG substituents, such as -CH_(3), -NH_(2) and -OCH_(3) increases the basicity and EWG substituents , such as -Cl, -NO_(2) and -CN decreases basicity. While sp^(2)- hybridized nitrogen atom in pyridine is less basic then the sp^(3) -hybridized nitrogen in an alkylamine. The most basic carbanion is :

The lone pair of amines makes them basic. They react with acids to form acid-base salts. Amines are more basic than alcohols, ethers and water. When an amine is dissolved in water, an equilibrium is established , where water acts as an acid and transfer a proton to the amine. The basic strength of an amine can be measured by basicity constant K_(b) . Arylamines are less basic than alkylamines because the lone pair of nitrogen is delocalised with the aromatic ring and are less available for donation. Substituted arylamines can be either more basic or less basic than aniline , depending on the substituted . ERG substituents, such as -CH_(3), -NH_(2) and -OCH_(3) increases the basicity and EWG substituents , such as -Cl, -NO_(2) and -CN decreases basicity. While sp^(2)- hybridized nitrogen atom in pyridine is less basic then the sp^(3) -hybridized nitrogen in an alkylamine. pK_(b) order of the following compound is : (I) NH_(2)OH" "(II) NH_(2)NH_(2)" "(III) NH_(3)" "(IV)H_(2)O

The typical reaction of benzene and other aromatic compounds are electrophilic substitution. Presence of electron donating group activates the ring towards electrophilic substitution, while presence of electron withdrawing group deactivates the ring towards electrophilic substituion but at the same time activates the ring towards nucleophilic subsituion. Some groups are predominantly meta-directing and all of these are deactivating. Except halogen, most of the o- and p- directing groups are activating groups. Which of the following compound is not formed. X represents mixture of organic compounds. The mixture does not contain

The typical reaction of benzene and other aromatic compounds are electrophilic substitution. Presence of electron donating group activates the ring towards electrophilic substitution, while presence of electron withdrawing group deactivates the ring towards electrophilic substituion but at the same time activates the ring towards nucleophilic subsituion. Some groups are predominantly meta-directing and all of these are deactivating. Except halogen, most of the o- and p- directing groups are activating groups. underset(Delta)overset(C_(2)H_(5)Cl.AlCl_(3))rarr(A) major. A is trisubstituted benzene. The structure of A is :

The typical reaction of benzene and other aromatic compounds are electrophilic substitution. Presence of electron donating group activates the ring towards electrophilic substitution, while presence of electron withdrawing group deactivates the ring towards electrophilic substituion but at the same time activates the ring towards nucleophilic subsituion. Some groups are predominantly meta-directing and all of these are deactivating. Except halogen, most of the o- and p- directing groups are activating groups. underset(Delta)overset(C_(2)H_(5)Cl.AlCl_(3))rarr(A) major. A is trisubstituted benzene. The structure of A is :

Knowledge Check

  • Assertion: Ammonia acts as a ligand. Reason : A lone pair of electrons on nitrogen can be donated to acceptor.

    A
    If both assertion and reason 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.

  • Assertion : Alkynes are less reactive than alkenes towards electrophilic reagents Reason : General formula of alkenes is CnH2n-2 a.If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion. b.If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion. c. Assertion is CORRECT but Reason is INCORRECT. d.If Assertion is INCORRECT but Reason is CORRECT.

    A
    If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.
    B
    If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.
    C
    I Assertion is CORRECT but Reason is INCORRECT.
    D
    If Assertion is INCORRECT but Reason is CORRECT.
    • RESONANCE ENGLISH-AROMATIC COMPOUNDS -Exercise -3 Part-I
    1. Assertion : In strongly acidic solution, aniline becomes less reactive...

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    2. How would you synthesis 4-methoxyphenol form bromobenzene in NOT more ...

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    3. Write structures of the products A, B,C,D and E in the following schem...

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    5. How would you carry out the following conversion efficiently using NOT...

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    6. Identify A, B, C, D and write the balanced chemical equations of forma...

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    7. under Hofmann conditions will give:

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    8. Which reagent (X) is used to convert I to II

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    9. Consider the pathway of a well known organic reaction Which step ...

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    10. CH(3) NH(2) + CHCl(3) + KOH rarr Nitrogen containing compound + KCl + ...

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    11. What are P & Q.

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    12. Reimer-Tiemann reaction introduces an aldehyde group on to the aromati...

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    13. Reimer-Tiemann reaction introduces an aldehyde group on to the aromati...

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    14. Reimer-Tiemann reaction introduces an aldehyde group on to the aromati...

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    15. In the reaction is/are:

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    16. Match the reactions in Column I with appropriate options in Column II.

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    17. The major product of the following reaction is :

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    18. Amongst the compounds given, the one that would form a brilliant color...

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    19. In the following reaction, the products formed is(are)

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    20. The major product(s) of the following is (are):

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