Answer
64.8k+ views
Hint:To decide which molecule has the highest boiling point, first we have to understand the factors that affect the boiling point. The formation of hydrogen bonding between molecules affects the boiling point.
Complete step-by-step answer:
Hydrocarbons have lower boiling points than alcohols because of absence of intermolecular hydrogen bonding. Ethers also have lower boiling point than alcohol because of absence of hydrogen bonding. Carboxylic acid has more boiling point than alcohol because they can form dimer.
Let’s find the correct option.
The given compounds are ethanol $\left( {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{OH}}} \right)$, ethanoic acid $\left( {{\rm{C}}{{\rm{H}}_3}{\rm{COOH}}} \right)$, methoxymethane$\left( {{\rm{C}}{{\rm{H}}_3}{\rm{COC}}{{\rm{H}}_{\rm{3}}}} \right)$ and ethane $\left( {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_6}} \right)$. As no intermolecular H-bonding present in case of ethane and methoxymethane, they have lower boiling point. Now the remaining two compounds are ethanol and ethanoic acid. Both can form intermolecular H-bond. But, ethanoic acid can form dimmer. The dimer forms because of the presence of H-bonding between carbonyl oxygen and acidic hydrogen. The dimer formation can be shown as below.
![](https://www.vedantu.com/question-sets/390ce697-89b7-4184-a08b-55fa357b8582809032231582102698.png)
Due to formation of dimmers, the van der Waals force increases, due to which the boiling point increases. So, the molecule whose boiling point is highest is ethanoic acid.
Hence, the correct option is B.
Addition Information:
A chemical bond where a hydrogen atom forms covalent bond with electronegative atoms like fluorine, nitrogen and oxygen is called hydrogen bond. There are two types of hydrogen bonding, intermolecular hydrogen bonding and intramolecular hydrogen bonding.
If the H-bonding occurs within the molecule, then this type of bonding is intramolecular H-bonding and if the H-bonding occurs between two same or different molecules, then this type of bonding is intermolecular H-bonding.
Note: The alcohols do not form dimers like carboxylic acid. The intermolecular H-bonding of ethanol can be shown as below:
![](https://www.vedantu.com/question-sets/aced842f-96b9-4ba6-a024-8dbd930bc79d2991920078763106494.png)
Complete step-by-step answer:
Hydrocarbons have lower boiling points than alcohols because of absence of intermolecular hydrogen bonding. Ethers also have lower boiling point than alcohol because of absence of hydrogen bonding. Carboxylic acid has more boiling point than alcohol because they can form dimer.
Let’s find the correct option.
The given compounds are ethanol $\left( {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{OH}}} \right)$, ethanoic acid $\left( {{\rm{C}}{{\rm{H}}_3}{\rm{COOH}}} \right)$, methoxymethane$\left( {{\rm{C}}{{\rm{H}}_3}{\rm{COC}}{{\rm{H}}_{\rm{3}}}} \right)$ and ethane $\left( {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_6}} \right)$. As no intermolecular H-bonding present in case of ethane and methoxymethane, they have lower boiling point. Now the remaining two compounds are ethanol and ethanoic acid. Both can form intermolecular H-bond. But, ethanoic acid can form dimmer. The dimer forms because of the presence of H-bonding between carbonyl oxygen and acidic hydrogen. The dimer formation can be shown as below.
![](https://www.vedantu.com/question-sets/390ce697-89b7-4184-a08b-55fa357b8582809032231582102698.png)
Due to formation of dimmers, the van der Waals force increases, due to which the boiling point increases. So, the molecule whose boiling point is highest is ethanoic acid.
Hence, the correct option is B.
Addition Information:
A chemical bond where a hydrogen atom forms covalent bond with electronegative atoms like fluorine, nitrogen and oxygen is called hydrogen bond. There are two types of hydrogen bonding, intermolecular hydrogen bonding and intramolecular hydrogen bonding.
If the H-bonding occurs within the molecule, then this type of bonding is intramolecular H-bonding and if the H-bonding occurs between two same or different molecules, then this type of bonding is intermolecular H-bonding.
Note: The alcohols do not form dimers like carboxylic acid. The intermolecular H-bonding of ethanol can be shown as below:
![](https://www.vedantu.com/question-sets/aced842f-96b9-4ba6-a024-8dbd930bc79d2991920078763106494.png)
Recently Updated Pages
Write a composition in approximately 450 500 words class 10 english JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Arrange the sentences P Q R between S1 and S5 such class 10 english JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
What is the common property of the oxides CONO and class 10 chemistry JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
What happens when dilute hydrochloric acid is added class 10 chemistry JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
If four points A63B 35C4 2 and Dx3x are given in such class 10 maths JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
The area of square inscribed in a circle of diameter class 10 maths JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)