Which of the following order is incorrect among the following ?
I) $C - X$ Bond length order is $H_{3} C - F < H_{3} C - Cl < H_{3} C - Br < H_{3} C - I$
II) $C - X$ Bond enthalpies order is $H_{3} C - F > H_{3} C - Cl > H_{3} C - Br > H_{3} C - I$
III) $C - X$ Bond dipole moment order is $H_{3} C - Cl < H_{3} C - F < {CH}_{3} - Br < {CH}_{3} - I$

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Only I & III

Only I & II

Only III

Only II & III

answer is D.

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Detailed Solution

The polarity of the $C - X$ bond is projected to rise when the electronegativity gap between carbon and halogen atoms increases.
Haloarenes have polarized $C - X$ bonds because halogens are more electronegative than carbon. Halogen draws the electron cloud more toward itself because of its strong electronegativity, giving it a slight negative charge, while carbon receives a slight positive charge.

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