The strongest base among the following is
Show Hint
The basic nature of amines is due to the presence of lone pair of electrons on the nitrogen atom which is available for the bond formation with Lewis acid
- $ {{C}_{6}}{{H}_{5}}N{{H}_{2}} $
- $ {{({{C}_{5}}{{H}_{5}})}_{2}}NH $
- $ N{{H}_{3}} $
- $ {{({{C}_{2}}{{H}_{5}})}_{2}}NH $
The Correct Option is D
Approach Solution - 1
The correct answer is Option D) \({{({{C}_{2}}{{H}_{5}})}_{2}}NH\)
The basic nature of amines is due to the presence of lone pair of electrons on the nitrogen atom which is available for the bond formation with Lewis acid. Due to the \(+I\) effect, \(2{}^\circ\) amine is more basic than \(1{}^\circ\) amine and \(N{{H}_{3}}\) . In the case of aromatic amines, the lone pair on the nitrogen atom are involved in resonance, therefore not available for bond formation, so aromatic amines are less basic. Hence, \((C_2H_5)_2NH\) is the strongest base among the given.
Discover More from Chapter: Amines
Approach Solution -2
The correct answer is Option D) \({{({{C}_{2}}{{H}_{5}})}_{2}}NH\)
Real Life Applications
Some real-life examples of amines are
1. Ammonia: It is used in a variety of applications, including cleaning products, fertilizer, and refrigerants.
2. Methylamine: It is used in a variety of applications, including as a precursor to other chemicals, a solvent, and a fuel.
3. Benzylamine: It is used in a variety of applications, including as a precursor to other chemicals, a solvent, and a corrosion inhibitor.
4. Histamine: Histamine is an amine that is produced by the body in response to an allergic reaction. It causes a variety of symptoms, including sneezing, itching, and hives.
Question can also be asked as
1. Which of the following is the strongest base?
2. What is the strongest base among ammonia, methylamine, ethylamine, and benzylamine?
3. Rank the following bases in order of strength: ammonia, methylamine, ethylamine, and benzylamine.
4. Which base has the highest pKa value?
Approach Solution -3
The correct answer is Option D) \({{({{C}_{2}}{{H}_{5}})}_{2}}NH\)
A base is
- A substance that combines with hydrogen ions as per Bronsted–Lowry theory.
- An electron-pair donor as per Lewis theory.
Types of Amines
- Primary Amines: These are formed when one hydrogen atom in ammonia is substituted by an alkyl or aromatic group. Examples of primary amines are Amino acids and methyl amine.
- Secondary Amines: These are the amines that have two organic substitutes either aryl or alkyl ones or both and are bound to the nitrogen together with one hydrogen. An example of a secondary amine is Dimethylamine.
- Tertiary Amines: These are the amines where the nitrogen consists of three organic substitutes. Examples of tertiary amines are Trimethylamine and EDTA.
Uses of Amines
- They are used in the manufacturing of azo dyes.
- Used in drugs.
- They are used in gas treatment during the removal of carbon dioxide from natural gas, etc.
- They are used as corrosion inhibitors.
Top Questions on Amines
- Number of compounds which give reaction with Hinsberg's reagent is_______.
- An amine $(\text{X})$ is prepared by ammonolysis of benzyl chloride. On adding $p$-toluenesulphonyl chloride to it, the solution remains clear.Molar mass of the amine $(\text{X})$ formed is _____ $\text{g mol}^{-1}$.(Given molar mass in $\text{g mol}^{-1}$: $\text{C} = 12, \, \text{H} = 1, \, \text{O} = 16, \, \text{N} = 14$)
- X of enthanamine was subjected to reaction with \(NaNO_2/HCl\) followed by hydrolysis to liberate \(N_2\) and HCl. The HCl generated was completely neutralised by 0.2 moles of NaOH. X is ____ g.
- Number of amine compounds from the following giving solids which are soluble in NaOH upon reaction with Hinsberg's reagent is _____.
- Given below are two statements:
Statement (I) : All the following compounds react with p-toluenesulfonyl chloride.
$C_6H_5NH_2 \quad (C_6H_5)_2NH \quad (C_6H_5)_3N$
Statement (II) : Their products in the above reaction are soluble in aqueous NaOH.
In the light of the above statements, choose the correct answer from the options given below.
Questions Asked in Manipal exam
- Pressure inside two soap bubbles are 1.01 atm and 1.03 atm. Ratio between their volumes is
- Manipal - 2013
- Surface tension
- Which of the following is the pribnow box?
- Manipal - 2013
- Transcription
- Who has written the book Genera Plantarum?
- Manipal - 2013
- Nomenclature and taxonomy
- There is loss in weight when mixture of $ L{{i}_{2}}C{{O}_{3}} $ and $ N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O $ is heated strongly. This loss is due to
- Manipal - 2013
- anomalous behaviour of lithium
- The main function of clitellum is
- Manipal - 2013
- earthworm
Concepts Used:
Amines
Amine is a type of compound which is derived from ammonia (NH3). According to Organic chemistry, they are basically classified as the functional groups of the organic nitrogen compounds that contain nitrogen atoms with a lone pair.
Amine - Types
Primary Amines:
It is formed when one hydrogen atom in ammonia is substituted by an alkyl or aromatic group. Amino acids and methyl amine are the best examples that why aromatic amines include aniline.
Secondary Amines:
Amines that have two organic substitutes either alkyl or aryl ones or both and are bound to the nitrogen together with one hydrogen are termed as secondary amines. For Example, Dimethylamine.
Tertiary Amines:
Tertiary Amines are the amines where the nitrogen consists of three organic substitutes. For example, Trimethylamine and EDTA.