2-chloropropane is heated with Na metal product is 2,3-dimethyl butane, reaction is:

Explanation

The reaction you described, where 2-chloropropane is heated with Na metal to produce 2,3-dimethyl butane, is a Wurtz reaction. The Wurtz reaction is a coupling reaction in which alkyl halides are reacted with alkali metals, such as sodium (Na) or potassium (K), to form larger hydrocarbon molecules. In this specific case, the 2-chloropropane reacts with Na to form 2,3-dimethyl butane. Thus the correct option is option B.