For the compounds CH3Cl, CH3Br, CH3I, and CH3F, the correct order of increasing C-halogen bond length is:

C-halogen bond length totally depends on the electronegativity difference between Carbon and halogen. The more the difference is, the less is the bond length. The electronegativity order of halogens is I<Br<Cl<F. Hence, the correct order of increasing C-halogen bond length is CH3F<CH3Cl<CH3Br<CH3I. Hence, the correct option is (A)