The boiling point of methanol is greater than methyl thiol because
a)
there is intramolecular hydrogen bonding in
methanol and intermolecular hydrogen bonding methyl thiol
b)
There is intermolecular hydrogen bonding in
methanol and no hydrogen bonding in methyl thiol
c)
There is no hydrogen bonding in methanol and
intermolecular hydrogen bonding in methyl thiol
d)
There is intermolecular hydrogen bonding in
methanol and intramolecular hydrogen bonding in methyl thiol
Correct answer is option 'B'. Can you explain this answer?

Question

The boiling point of methanol is greater than methyl thiol because

a)
there is intramolecular hydrogen bonding in
methanol and intermolecular hydrogen bonding methyl thiol
b)
There is intermolecular hydrogen bonding in
methanol and no hydrogen bonding in methyl thiol
c)
There is no hydrogen bonding in methanol and
intermolecular hydrogen bonding in methyl thiol
d)
There is intermolecular hydrogen bonding in
methanol and intramolecular hydrogen bonding in methyl thiol

Correct answer is option 'B'. Can you explain this answer?

Answer

**Explanation:**

The boiling point of a substance is determined by the strength of intermolecular forces present in the substance. In this case, we are comparing the boiling points of methanol (CH3OH) and methyl thiol (CH3SH).

**Intermolecular Hydrogen Bonding in Methanol:**

Methanol contains a hydroxyl group (-OH), which is highly polar due to the electronegativity difference between oxygen and hydrogen. This polar -OH group can form hydrogen bonds with other methanol molecules. Hydrogen bonding is a strong intermolecular force that requires the presence of a hydrogen atom bonded to a highly electronegative atom (such as oxygen or nitrogen) and a lone pair of electrons on another electronegative atom (such as oxygen, nitrogen, or fluorine).

In methanol, the hydrogen atom in the -OH group can form a hydrogen bond with the lone pair of electrons on the oxygen of another methanol molecule. These hydrogen bonds are responsible for the high boiling point of methanol because they require a significant amount of energy to break.

**No Hydrogen Bonding in Methyl Thiol:**

In contrast to methanol, methyl thiol does not contain a highly electronegative atom (such as oxygen or nitrogen) capable of forming hydrogen bonds. The sulfur atom in methyl thiol is less electronegative than oxygen, and it does not have a lone pair of electrons available for hydrogen bonding.

Without the presence of hydrogen bonding, the intermolecular forces in methyl thiol are weaker compared to methanol. Weaker intermolecular forces require less energy to overcome, resulting in a lower boiling point for methyl thiol compared to methanol.

**Conclusion:**

The correct answer is option B because there is intermolecular hydrogen bonding in methanol, which results in stronger intermolecular forces and a higher boiling point. On the other hand, methyl thiol does not exhibit hydrogen bonding, leading to weaker intermolecular forces and a lower boiling point.

Answer

Methanol has high boiling point than Methyl thiol because there is intermolecular hydrogen bonding in methanol and no hydrogen bonding in Methyl thiol.

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