Statement I: In strongly acidic solutions , anline becomes more reactive towards electrophilic reagents ltbRgt Statement II: The amino group being completely protonated in strongly acidic solution, the line pair of electrons on nitrogen is no longer avalible for resonace.
Statement I: In strongly acidic solutions , anline becomes more reactive towards electrophilic reagents ltbRgt Statement II: The amino group being completely protonated in strongly acidic solution, the line pair of electrons on nitrogen is no longer avalible for resonace.
A
Statement (I) is true : Statement (II) is true : Statement (II) is the correct esplanation of Statement (I)
B
Statement (I) is true : Statement (II) is true , Statement (II) is not the correct exphanation fo sTatement (I)
C
Statement I is True, Statament II is false
D
Statement (I) is false , Statement (II) is true .
Text Solution
Verified by Experts
The correct Answer is:
(d)
In strongly acidic medium , aniline is protanated , so ` LP bar(e)` s are not available to produce mesomeric or electromeric effect , thus, aniline becomes less reactive towards (SE) reactions . Staement (I) is incorrect n, but Statement (II) is correct .
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Statement-I : Alkyness are more reactive than alkenes towards electrophilic reagents like H^(+) . Because Statement-II : The alkyl carbocation formed from alkene is more stable than the uinyl carbocation formed from alkyne.
(a) Account for the following : (i) Propanal is more reactive than propanone towards nucleophilic reagents. (ii) Electrophilic substitution in benzoic acid taken place at meta position. (iii) Carboxylic acids do not distinguish between the following pairs of compounds : (b) Give simple chemical test to distinguish between the following pairs of compounds : (i) Acetophenone and benzaldehyde (ii) Benzoic acid and ethylbenzoate.
Knowledge Check
Assertion: In strongly acidic solutions, aniline becomes more reactive towards electrophilic reagents. Reason: the amino group being completely protonate din strongly acidic solution, the lone pair of electrons on the nitrogen is no longer available for resonance.
Assertion: In strongly acidic solutions, aniline becomes more reactive towards electrophilic reagents. Reason: the amino group being completely protonate din strongly acidic solution, the lone pair of electrons on the nitrogen is no longer available for 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.
Statement-1: In strongly acid solutions, aniline becomes less reactive less reactive towards electrophilic reagents. Statement-2: The amino group being completely protonated in strongly acidic solution, the lone pair of electrons on the nitrogen in no longer available for resonance.
Statement-1: In strongly acid solutions, aniline becomes less reactive less reactive towards electrophilic reagents. Statement-2: The amino group being completely protonated in strongly acidic solution, the lone pair of electrons on the nitrogen in no longer available for resonance.
A
Statement-1 is true, statement-2 is true, statement-2 is a correct explanation for statement-1
B
Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement-1
C
Statement-1 is true, statement-2 is false
D
Statement-1 is false, statement-2 is true
Statement-I: Acyl halide are more reactive than acid substance amide towards nucleophilic substitution. Because Statement-II: X^(-) are better leaving group than NH_(2) .
Statement-I: Acyl halide are more reactive than acid substance amide towards nucleophilic substitution. Because Statement-II: X^(-) are better leaving group than NH_(2) .
A
Statement-I is True, Statement-II is True : Statement-II is a correct explanation for Statement-I
B
Statement-I is True, Statement-II is True : Statement-II is `NOT` a correct explanation for Statement-I
C
Statement-I is True, Statement-II is False.
D
Statement-I is False, Statement-II is True.
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Statement - I: A very dilute acidic solution of Cd^(2+) and Ni^(2+) gives yellow precipitate of CuS on passing H_(2)S Statement - II : The solubility product of CdS is more than that of NiS
Statement I A very dilute acidic solution of Cd^(2+) and Ni^(2+) gives yellow precipitate of CdS on passing H_(2)S . Statement II Solubility product of CdS is more than that of NiS .
Every amino acids has a carboxyl group and an amino and each group can exist ian acidic form or a basic form depending on the pH of the solution in which the amino acid is dissolved. The carboxyl groups of the amino acids have pka values of approximately 2, the protonated amino group have pka values neare 9. therefore, in a very acidic solutions (pH near zero), both the groups will be in their acidic forms. At a pH of 7 (which is greater than the pka of the protonated amino group), the carboxyl group will be in its basic form and the amino group will be in its acidic form. in a strongly basic solution (say pH=11) both the groups will be in the basic form. underset("(neutral not isolated)")(R-underset(NH_(2))underset(|)(CH_(2))-overset(O)overset(||)(C)-OH)overset(H^(+))(hArr) underset("(A)")(R-underset(NH_(3))underset(|+)(CH)-OH) hArrunderset("(B)")(R-underset(NH_(3))underset(+|)(C)-overset(O)overset(||)(C)-O^(-))+H^(+) hArr underset("(C)")(R-underset(NH_(2))underset(|)(CH)-overset(O)overset(||)(C)-O) For C(anionic) of an amino acid exists in
Every amino acids has a carboxyl group and an amino and each group can exist ian acidic form or a basic form depending on the pH of the solution in which the amino acid is dissolved. The carboxyl groups of the amino acids have pka values of approximately 2, the protonated amino group have pka values neare 9. therefore, in a very acidic solutions (pH near zero), both the groups will be in their acidic forms. At a pH of 7 (which is greater than the pka of the protonated amino group), the carboxyl group will be in its basic form and the amino group will be in its acidic form. in a strongly basic solution (say pH=11) both the groups will be in the basic form. underset("(neutral not isolated)")(R-underset(NH_(2))underset(|)(CH_(2))-overset(O)overset(||)(C)-OH)overset(H^(+))(hArr) underset("(A)")(R-underset(NH_(3))underset(|+)(CH)-OH) hArrunderset("(B)")(R-underset(NH_(3))underset(+|)(C)-overset(O)overset(||)(C)-O^(-))+H^(+) hArr underset("(C)")(R-underset(NH_(2))underset(|)(CH)-overset(O)overset(||)(C)-O) Form A (cationic ) of an amino group exists in
Every amino acids has a carboxyl group and an amino and each group can exist ian acidic form or a basic form depending on the pH of the solution in which the amino acid is dissolved. The carboxyl groups of the amino acids have pka values of approximately 2, the protonated amino group have pka values neare 9. therefore, in a very acidic solutions (pH near zero), both the groups will be in their acidic forms. At a pH of 7 (which is greater than the pka of the protonated amino group), the carboxyl group will be in its basic form and the amino group will be in its acidic form. in a strongly basic solution (say pH=11) both the groups will be in the basic form. underset("(neutral not isolated)")(R-underset(NH_(2))underset(|)(CH_(2))-overset(O)overset(||)(C)-OH)overset(H^(+))(hArr) underset("(A)")(R-underset(NH_(3))underset(|+)(CH)-OH) hArrunderset("(B)")(R-underset(NH_(3))underset(+|)(C)-overset(O)overset(||)(C)-O^(-))+H^(+) hArr underset("(C)")(R-underset(NH_(2))underset(|)(CH)-overset(O)overset(||)(C)-O) For B is called