Question

Which of the following is the strongest base?
(A) \[{C_6}{H_5}N{H_2}\]
(B) \[C{H_3}N{H_2}\]
(C) \[N{H_3}\]
(D) \[C{H_3}CON{H_2}\]

Answer 1

Hint: To solve this problem firstly we should know what bases are and how are they classified into strong and weak bases. We will firstly study all the terms and the concept behind, and hence, it will help us to reach the conclusion for our question.

Complete step by step solution:
In Chemistry, bases are substances that release hydroxide ions, have slippery nature, they have a bitter taste , and can change the colour of indicators (for Eg. Turn red litmus paper to blue) , react with acids to form salts and can promote chemical reactions.
We can differentiate bases as the opposite of Acids; however some acids may also act as bases. We can classify bases into 4 types which are known as –
> Types of Bases
i) Strong base – It is a compound that has an ability to remove a proton from a very weak acid. Or they completely dissociate into its ions when in water. Examples are potassium hydroxide (KOH), sodium hydroxide (NaOH).
ii) Weak base – When there is dissociation in water. The solution contains both the weak base as well as strong acid. Examples are ammonia (NH$_3$), water (H$_2$O)
- Neutral base – When a bond is formed with a neutral acid that shares an electron pair.
- Solid base – they are active in the solid form. Examples are silicon dioxide and sodium hydroxide mounted on alumina.
 Now, as we know, due to +I effect of methyl group hence the electrons are more concentrated over nitrogen. And we know that strong bases remove proton from very weak acids hence with this we can conclude that that correct answer among all the options is $C{H_3}N{H_2}$ as we know that it is the strongest base among all the given options as $N{H_3}$ group in this case, is directly attached to the Methyl group $C{H_3}$.
Hence, the correct answer is option is B.

Note: So here we concluded that Bases can be categorised in different forms and how we can see the strong bases act with the weak bases. The properties of bases can be listed as
Have a bitter taste.
Soapy to touch.
Turns red litmus blue.
Conducts electricity in solution.
Release OH– ions in Aqueous Solution