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Polarity of C-X bond order (most polar first):
AF = Cl
BAll same
CF > Cl > Br > I (electronegativity decreases down group)
DI > Br > Cl > F
Answer & Solution
Correct answer: C. F > Cl > Br > I (electronegativity decreases down group)
Electronegativity: F (4.0) > Cl (3.0) > Br (2.8) > I (2.5). So C-F is most polar. But C-X bond strength: C-F > C-Cl > C-Br > C-I (decreasing down group).
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