Given the compound 1,4-dimethylbenzene (also known as p-xylene), how many distinct $1^H$ NMR signals would you expect to observe?

For the following compounds, how many unique ${\mathrm{^\{13\}}}^C$ NMR signals would you expect each to exhibit? (A) ${\mathrm{CH}}_3\mathrm{CH}2{\mathrm{CH}}_3$ (propane), (B) ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_3$ (n-butane), (C) ${\mathrm{CH}}_3\mathrm{CH}\left({\mathrm{CH}}_3\right){\mathrm{CH}}_3$ (isobutane)

How many singlets are expected in the $1^H$ NMR spectrum of 2,2,4,4-tetramethylpentane?

Which $1^H$ NMR spectrum could be representative of 1,3,5-trimethylbenzene?

How many signals would you expect in the $H^1$ NMR spectrum of ${\mathrm{CH}}_{3}O{\mathrm{CH}}_3$ (dimethyl ether)?

For the molecule ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$ (ethanol), how many distinct $1^H$ NMR signals are expected?

Which of the following compounds would give a $1H$ NMR spectrum with a single signal?

How many unique $C^{13}$ NMR signals would be observed for ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_3$ (n-butane)?