Answer
399k+ views
Hint: To attempt this question first draw the structure of \[3 - \]methyl\ [- 2 - \]butanol and treat it with hydrochloric acid or$HCl$. The product will be a carbocation, after getting the product we have to look for the stability of carbocation and rearrange it accordingly.
Complete step by step answer:
The mechanism of this reaction involves $4$ steps
Step: 1
Protonation: is also known as hydro nation is addition of proton or a hydrogen cation to an atom, molecule. This forms a conjugate acid of that particular compound. In this question the \[3 - \]Methyl\ [- 2 - \]butanol accepts a pair of protons which gets attached to the $'OH'$ ion.
Step: 2
Now the formation of carbocation takes place. Carbocation is a molecule in which a carbon atom has $3$ positive charges. This is also known as carbonium ion. It is divided into $3$ groups, primary, secondary and tertiary. After the attachment of the proton to the $'OH'$ ion a secondary carbocation is formed by the elimination of water ${H_2} O$.
Step: 4
After the elimination of water, a hydride shift takes place. Hydride shift is a type of rearrangement in a carbocation. In this type of shift the hydrogen atom in a carbocation migrates to the carbon atom which has the formal charge of $ + 1$(carbon$2$) from an adjacent carbon (carbon$1$).
Step: 5
After the hydride shift the tertiary carbocation is formed which is more stable. Now the \['Cl'\] molecule attacks on the tertiary carbocation which is also known as the nucleophilic attack.
The answer is A. $2 - $$2 - $chloro$2 - $methylbutane
Note:
Unimolecular substitution reactions are favoured when tertiary substrates such as 3-methyl2-butanol are reacted with a good nucleophile such as chlorine ion under protic aprotic conditions that is in acidic medium.
Complete step by step answer:
![seo images](https://www.vedantu.com/question-sets/ef35c064-8453-4e83-a7da-824a1c2784eb2536721120468842926.png)
The mechanism of this reaction involves $4$ steps
Step: 1
Protonation: is also known as hydro nation is addition of proton or a hydrogen cation to an atom, molecule. This forms a conjugate acid of that particular compound. In this question the \[3 - \]Methyl\ [- 2 - \]butanol accepts a pair of protons which gets attached to the $'OH'$ ion.
Step: 2
Now the formation of carbocation takes place. Carbocation is a molecule in which a carbon atom has $3$ positive charges. This is also known as carbonium ion. It is divided into $3$ groups, primary, secondary and tertiary. After the attachment of the proton to the $'OH'$ ion a secondary carbocation is formed by the elimination of water ${H_2} O$.
Step: 4
After the elimination of water, a hydride shift takes place. Hydride shift is a type of rearrangement in a carbocation. In this type of shift the hydrogen atom in a carbocation migrates to the carbon atom which has the formal charge of $ + 1$(carbon$2$) from an adjacent carbon (carbon$1$).
Step: 5
After the hydride shift the tertiary carbocation is formed which is more stable. Now the \['Cl'\] molecule attacks on the tertiary carbocation which is also known as the nucleophilic attack.
The answer is A. $2 - $$2 - $chloro$2 - $methylbutane
Note:
Unimolecular substitution reactions are favoured when tertiary substrates such as 3-methyl2-butanol are reacted with a good nucleophile such as chlorine ion under protic aprotic conditions that is in acidic medium.
Recently Updated Pages
Mark and label the given geoinformation on the outline class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
When people say No pun intended what does that mea class 8 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Name the states which share their boundary with Indias class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give an account of the Northern Plains of India class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Change the following sentences into negative and interrogative class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Advantages and disadvantages of science
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
10 examples of evaporation in daily life with explanations
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
How do you graph the function fx 4x class 9 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference Between Plant Cell and Animal Cell
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
What are the monomers and polymers of carbohydrate class 12 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)