Assertion Reason Chemistry Chapter 9 Amines
Questions of Assertion Reason of Chemistry Chapter 9 Amines CBSE Class 12 are very simple to understand as this chapter deals with Amines. To solve assertion reason type questions of Chemistry, a deeper understanding of concept about Structure of Amines, Classification, Nomenclature, Preparation of Amines, Physical Properties, Chemical Reactions, Method of Preparation of Diazonium Salts, Physical Properties, Chemical Reactions and Importance of Diazonium Salts in Synthesis of Aromatic Compounds is required. In order to help the student in solving Assertion Reason type of questions, detailed process is explained.
How to solve Assertion Reason Type Questions?
In Assertion-Reason type of question, two statements are given, first is Assertion and second is called Reason. Student must have to think critically about both the statements in Assertion Reason Questions, since it combines multiple choice questions and true/false type of questions which requires a higher level of understanding.
How many types are there of Assertion Reason Type Questions?
Assertion-Reason type of questions can be asked either with four MCQ options or with five MCQ options. First four options are same in both the cases only one more options is being provided i.e. last one. One extra option increases the difficulty level of the questions.
In assertion reason type of questions, all 4 or 5 options are same for each question, which are as:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
(e) Both Assertion and Reason are false.
Then a question haunts in every student’s mind, which option is correct and when?
This can be understood clearly with the following table:
| Assertion (A) | Reason (R) | MCQ Options (Fixed for all questions) |
|---|---|---|
| If True | True | (a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). |
| If True | True | (b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). |
| If True | False | (c) Assertion (A) is true but reason (R) is false. |
| If False | True | (d) Assertion (A) is false but reason (R) is true. |
| If False | False | (e) Both Assertion and Reason are false. |
Now, lets practice some Assertion Reason Questions of Chemistry: Chapter 9 Amines
Read instructions carefully before answering the questions.
For question given below, two statements are given- one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
(a) Both A and R are true and R is correct explanation of the assertion.
(b) Both A and R are true but R is not the correct explanation of the assertion.
(c) A is true but R is false.
(d) A is false but R is true.
Question.1.
Assertion: Aromatic 1° amines can be prepared by Gabriel phthalimide synthesis.
Reason: Aryl halides undergo nucleophilic substitution with anion formed by phthalimide.
Ans.1. (a)
Both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
Question.2.
Assertion: Only a small amount of HCl is required in the reduction of nitro compounds with iron scrap and HCl in the presence of steam.
Reason: FeCl_{2} formed gets hydrolysed to release HCl during the reaction.
Ans.2. (d)
Assertion and Reason are incorrect.
Question.3.
Assertion: Amines are basic in nature.
Reason: Amines have lone pair of electrons on nitrogen atom.
Ans.3. (a)
Amines are basic due to the presence of a lone pair of electrons on nitrogen atom. The lone pair can be easily donated.
Question.4.
Assertion: Acetanilide is less basic than aniline.
Reason: Acetylation of aniline results in decrease of electron density on nitrogen.
Ans.4. (d)
Assertion and Reason are incorrect.
Question.5.
Assertion: Nitration of aniline can be conveniently done by protecting the amino group by acetylation.
Reason: Acetylation increases the electron-density in the benzene ring.
Ans.5. (c) Acetylation decreases the electron-density in the benzene ring thereby preventing oxidation.
Question.6.
Assertion: Aniline does not undergo Friedel-Crafts reaction.
Reason: –NH_{2} group of aniline reacts with AlCl_{3} (Lewis acid) to give acid-base reaction.
Ans.6. (a)
Both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
Question.7.
Assertion: Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly-substituted product.
Reason: Acyl group sterically hinders the approach of further acyl groups.
Ans.7. (c)
Assertion is correct but Reason is incorrect.
Question.8.
Assertion: Nitrating mixture used for carrying out nitration of benzene consists of conc. HNO_{3}+ conc.H_{2}SO_{4} .
Reason: In presence of H_{2}SO_{4} , HNO_{3} acts as a base and produces NO_{2}^{+} ions.
Ans.8. (a)
Both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.