Which of the following order is correct ...

Which of the following order is correct among the following ?
`C-X ` Bond length order is
`H_3C -F lt CH_3 C-Cllt H_3 C- Br lt H_3 C-l`
( ii) C- X Bond enthalapies order is
` H_3C -Clgt H_3 C -F gt CH_3 -Br gt CH_3-I`
(III) C-X Bond dipole moment order is
` H_3C-Cl gt H_3 C-F gt CH_3 -Br gt CH_3 -I `

Only I & II

Only II & III

Only I & III

All are correct

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