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Q.

A: Boiling point of neopentane is more than n-pentane. 

R: Increase in van der Waals forces increases boiling point.

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a

A and R are true, R explains A

b

A and R are true, R does not explain A

c

A is true, but R is false

d

A is false, but R is true

answer is D.

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Detailed Solution

  • n- pentane and neopentane are isomeric alkanes. 
  • Effective surface area reduces because of branching. Due to this van der Waals forces and boiling also decreases. So, A is an incorrect statement and R is correct.
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