Given below are two statements: One is labelled as Assertion A an…

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MCQ

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$.

Assertion $A:$ Butan$-1-$ol has higher boiling point than ethoxyethane.

Reason $R:$ Extensive hydrogen bonding leads to stronger association of molecules.

In the light of the above statements, choose the correct answer from the options given below:

✓
Both $A$ and $R$ are true and $R$ is the correct explanation of $A$
B
$A$ is true but $R$ is false
C
Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$
D
$A$ is false but $R$ is true

✓

Answer

Correct option: A.

Both $A$ and $R$ are true and $R$ is the correct explanation of $A$

a
Butan$-1-$ol $\left( CH _3 CH _2 CH _2 CH _2 OH \right)$ can undergo hydrogen bonding. Ethoxyethane $\left( CH _3 CH _2-\right.$ $O - CH _2 CH _3$ ) has no hydrogen (attached with $F$, $O , N$ ) which can undergo hydrogen bonding. More is the extent of intermolecular $H$-bonding, more will be association of molecules. Thus leading to higher boiling point.Hence both Assertion $(A)$ and Reason$(R)$ are true and $( R )$ is the correct explanation of $( A )$.