The assertion and the reason are both correct and the reason correctly explains the assertion.

Step 1: Understanding the Assertion
The boiling point of alkanes does increase with an increase in molecular weight. This is because as the size (and therefore the molecular weight) of the alkane increases, more energy is required to break the intermolecular forces between the molecules, leading to a higher boiling point.

Step 2: Understanding the Reason
Van der Waals forces are a type of intermolecular force that exist between molecules. These forces increase with an increase in the size of the molecule. This is because larger molecules have a larger electron cloud, which increases the strength of the temporary dipoles that cause van der Waals forces.

Step 3: Connecting the Assertion and Reason
The reason correctly explains the assertion. As the molecular weight (and therefore size) of the alkane increases, the strength of the van der Waals forces between the molecules also increases. This means that more energy is required to break these forces and cause the substance to boil, leading to a higher boiling point.

Question

The assertion and the reason are both correct and the reason correctly explains the assertion.

Step 1: Understanding the Assertion
The boiling point of alkanes does increase with an increase in molecular weight. This is because as the size (and therefore the molecular weight) of the alkane increases, more energy is required to break the intermolecular forces between the molecules, leading to a higher boiling point.

Step 2: Understanding the Reason
Van der Waals forces are a type of intermolecular force that exist between molecules. These forces increase with an increase in the size of the molecule. This is because larger molecules have a larger electron cloud, which increases the strength of the temporary dipoles that cause van der Waals forces.

Step 3: Connecting the Assertion and Reason
The reason correctly explains the assertion. As the molecular weight (and therefore size) of the alkane increases, the strength of the van der Waals forces between the molecules also increases. This means that more energy is required to break these forces and cause the substance to boil, leading to a higher boiling point.

Knowee AI · Accepted Answer

The assertion and the reason are both correct and the reason correctly explains the assertion.

Step 1: Understanding the Assertion
The boiling point of alkanes does increase with an increase in molecular weight. This is because as the size (and therefore the molecular weight) of the alkane increases, more energy is required to break the intermolecular forces between the molecules, leading to a higher boiling point.

Step 2: Understanding the Reason
Van der Waals forces are a type of intermolecular force that exist between molecules. These forces increase with an increase in the size of the molecule. This is because larger molecules have a larger electron cloud, which increases the strength of the temporary dipoles that cause van der Waals forces.

Step 3: Connecting the Assertion and Reason
The reason correctly explains the assertion. As the molecular weight (and therefore size) of the alkane increases, the strength of the van der Waals forces between the molecules also increases. This means that more energy is required to break these forces and cause the substance to boil, leading to a higher boiling point.

Assertion : Boiling point of alkanes increases with increase in molecular weight.Reason : van der Waals forces increase with increase in molecular weight

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