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Alkyl halides except fluorides on reduction with $\ce{Zn}$ and dil. $\ce{HCl}$ gives alkane. Example:

$$\ce{CH3Cl + H2 -> CH4 + HCl}$$

Why cannot alkyl fluorides be reduced?

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Other answers may be more elegant, but it boils down to the carbon-fluorine bond being too strong, in fact stronger than carbon-carbon or carbon-hydrogen bonds. The required bond breaking simply cannot be done under normal conditions. Similarly Grignard reagents (formed with a much more powerful reducing agent) are much less common with fluorine than with heavier halogens, and the bad things chlorofluorocarbons do to our ozone layer come from breaking $\ce{C-Cl}$ rather rhan $\ce{C-F}$ bonds.

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