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The sum of fluorine atoms in monomers of...

The sum of fluorine atoms in monomers of PTFE and PCTFE is _____.

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The correct Answer is:
7
(A) PTFE - polytetra flouroethane `-CF_(2) = CF_(2) - 4`
PCTFE - polychloro triflouroethane - `F_(2)C = CFCl - 3` , Sum 4+3 = 7
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