Question

7. Greater the number of carbon atoms in the chain of fatty acid .......
(a) The boiling point will be higher (b) The boiling point will be lower
(c) The melting point will be higher (d) The melting point will be lower​

Answer 1

Answer:

d

Explanation:

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Answer 2

Answer:

Both (a) and (c) are correct.

Explanation:

1. Relationship between the length of the carbon chain and boiling point:

• As the number of carbon atoms grows, the boiling point rises along with the van der Waal's force. The first four members of the alkane family are therefore gases, pentane through heptadecane is a liquid, and higher alkanes are solids as a result.

• Because longer chain molecules entangle and wrap around one another like the strands of spaghetti, longer chain molecules have higher boiling points.

2. Relationship of carbon chain length and melting point:

• The melting point of a fatty acid chain rises as the number of carbons in the chain rises, in direct proportion to the length of the carbon chain.
• Longer chain fatty acids are more likely to be solid at room temperature while shorter chain fatty acids are more likely to be liquid.

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