Q.

(A) Acetic acid in vapour state shows a molecular mass of 120. 
(R) It undergoes intermolecular hydrogen bond & forms a dimer.

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a

Both (A) and (R) are true and (R) is the correct explanation of (A)

b

Both (A) and (R) are true but (R) is not the correct explanation of (A)

c

(A) is true but (R) is false

d

Both (A) and (R) are false

answer is A.

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Detailed Solution

Acetic accid has actual molecular mass 60 , but due to intermolecular hydrogen bonding its appearent molecular weight is 120. 

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(A) Acetic acid in vapour state shows a molecular mass of 120. (R) It undergoes intermolecular hydrogen bond & forms a dimer.