Chemistry · Hydrocarbons
NEET (UG) 2024 — Question 64
Given below are two statements:
Statement I: The boiling point of three isomeric pentanes follows the order n-pentane > isopentane > neopentane
Statement II : When branching increases, the molecule attains a shape of sphere. This results in smaller surface area for contact, due to which the intermolecular forces between the spherical molecules are weak, thereby lowering the boiling point.
In the light of the above statements, choose the most appropriate answer from the options given below:
- Option A:Correct
Both Statement I and Statement II are correct
- Option B:
Both Statement I and Statement II are incorrect
- Option C:
Statement I is correct but Statement II is incorrect
- Option D:
Statement I is incorrect but Statement II is correct
Answer: A
Step-by-step solution
Both statement I and statement II are correct.
Boiling point of n-pentane
As branching increases molecules attain the shape of a sphere results in smaller area of contact thus
weak intermolecular forces between spherical molecules, which are overcome at relatively lower
temperature. Leading to decrease in boiling point.
Answer key and solution verified before publishing.
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- Exam
- NEET (UG) 2024
- Paper
- 2024 paper
- Subject
- Chemistry
- Chapter
- Hydrocarbons
- Topic
- Properties & Uses of Alkanes