Which of the following order is correct among
the following ?
I) C–X Bond length order is H₃C–F < H₃C –Cl < H₃C–Br < H₃C–I
II) C–X Bond enthalpies order is H₃C–F > H₃C –Cl > H₃C–Br > H₃C–I
III) C–X Bond dipole moment order is H₃C–Cl > H₃C–F > CH₃–Br > CH₃–I

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All are correct

Only I & II

Only I & III

Only II & III

answer is D.

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Detailed Solution

As the size of halogen atom increases, the C−X bond length increases and hence, the C−X bond strength decreases.
Bond length $\propto \frac{1}{B . E}$
Order of dipole moment based on E.N of halogen and bond length of C-X bond.

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