Give reason for the following
`SN_1` reaction is accompanied by racemisation in optically active alkyl halides.

Give reasons: (i). C-Cl bond length in chlorobenzene is shorter than C-Cl bond length in CH_(3)-Cl (ii). The dipole moment of chlorobenzene is less than of cyclohexyl chloride. (c). S_(N^(1)) reactions are are accompanied by racemisation is optically active alkyl halides.

Give an example of beta -elimination reaction of alkyl halides.

Give an example of beta -elimination reaction of alkyl halides.

In S_(N^(1)) reaction an optically active substrates mainly gives