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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

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 correct explanation of the assertion

C

If assertion is correct but reason is incoorect

D

If assertion is incorrect but reason is correct

Text Solution

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The correct Answer is:
A
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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 :

ALLEN-ALKENE, ALKANE & ALKYNE -EXERCISE-5[B]
  1. A positive carbylamine test is shown by :

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  2. Among the following, the strongest base is:

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  3. Assertion : In strongly acidic solution, aniline becomes less reactive...

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  4. The correct order of basicities of the following compounds is - (I) ...

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  5. When phenol is treated with Br(2)-water, the product is

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

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  7. In the following reaction, underset("conc." H(2)SO(4))overset("conc."...

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  8. An organic compound contains 69.4% carbon and 5.8% hydrogen. A sample ...

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  9. Compound 'X' containing chlorine, on treatment with NH(3) gives a soli...

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  10. Show with equations how the following compounds are repared (equations...

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  11. Complete the following with appropriate structures :

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  12. The aqueous solution of a nitrogen and chlorine containing compound (A...

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  13. Complete the following with appropriate structures : 2,3 "-Dinitroan...

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  14. Complete the following reaction with appropriate reagents :

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  15. Compund (A), C(5)H(11)NO is not soluble in cold alkaline or acidic sol...

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  16. Identify (A) to (D) in the following series of reactions : underset...

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  17. underset ((X)) underset ("Optically active") (C5 H(13)N) underset (N2)...

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  18. The major product of the following reaction is

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  19. In the reaction shown below, the major product (s) formed is/are

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  20. In the following reactions the major product W is

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