No, you can't light TNT with regular torches, but a Redstone Torch placed next to it, will set it off.
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You Need to use an torch then right click the TNT
redstone torch
Place a block of TNT down then place a red stone torch beside it.
#$# $#$ #$# # = Gunpowder $ = Sand
Set down the block of TNT, then ignite it with a flint and steel, or use a redstone current from a redstone torch.