how come acetone doesn't show 2 singlets on H NMR?

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When there is symmetry they overshadow one another so you only see one peak. You always have to look for symmetry in the compound.

Haha, i just learned this 15 minutes ago. Thank you POOYAH!
 
hmm then how come a benzene with 2 OMe's para to each other have 2 singlets...isn't the symmetrical too?

i have NMR =(
 
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