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  4. Benzoic acid dissolved in benzene shows a molecular weight of:

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Q. Benzoic acid dissolved in benzene shows a molecular weight of:

Haryana PMTHaryana PMT 2004

Solution:

Benzoic acid dimerises in benzene.
Mol. wt. of benzoic acid $ =78+12+32=122 $
Hence, molecular weight of benzoic acid in benzene is
$ =122+122=244 $