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Phenol (mol.wt.94) is dimerised to 60% i...

Phenol (mol.wt.`94`) is dimerised to `60%` in a solvent, the observed molecular weight of phenol will be:

A

(a) Less than `94`

B

(b) `134.2`

C

(c ) `100`

D

(d) `150`

Text Solution

Verified by Experts

The correct Answer is:
B
`("Normal mol.wt")/("Observed mol.wt.")=1-alpha+(alpha)/(n)`,
Given `alpha=0.6 and n=2`
`:. "observed mol.wt".=(94)/(0.7)=134.2`
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