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Question

Which of the following does not decolourize bromine water?


A

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B

F2C=CF2

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C

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D

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Solution

The correct options are
A


B

F2C=CF2


C


(a) and (c) aromatic (delocalization ofπ¯es) so they do not give decolourisaiton of Br2 solution (test of unsaturation)

(b) Due to EWG, four F atoms, ¯e density or the nucleophilicity around C=C decrease and the compound does not give the test for unsaturation.


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