Butane can be converted into 2-methylpropane, if heated with:
Correct option is A. $$AlCl_{3}$$
Isomerisation of an alkane takes place when reacted with $$\mathrm{AlCl_3}$$.
So, for converting butane into 2-methylpropane, butane may be reacted with $$\mathrm{AlCl_3}$$.
Hence, Option "A" is the correct answer.