Q.

Assertion (A) :  Boiling point order of  isomeric pentane follows,n-pentane > isopentane > neopentane.

 Reason (R) :  Branching weakens the Van der Waals forces of attractions in isomeric alkanes 

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a

 A and R are true and R is the correct explanation of A.

b

  Both A and R are false.

c

A is true, R is false.    

d

A and R are true and R is not the correct explanation of A.

answer is A.

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Detailed Solution

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Boiling point of n-pentane, isopentane and neopentane are 36.1 °C, 27.8°, 9.5°C respectively

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Assertion (A) :  Boiling point order of  isomeric pentane follows,n-pentane > isopentane > neopentane. Reason (R) :  Branching weakens the Van der Waals forces of attractions in isomeric alkanes