$\mathrm{CH}_3 \mathrm{OH}$ and $\mathrm{CH}_3 \mathrm{COCH}_3$ are separated by fractional distillation

In sodium nitroprusside test for Sulphur, the violet colour is due to formation of complex $\mathrm{Na}_4\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right]$

$\mathrm{CH}_3 \mathrm{COO}^{-}, \mathrm{CN}^{-}, \mathrm{CH}_3 \mathrm{OH}, \mathrm{CH}_3-\mathrm{O}-\mathrm{CH}_3,\left(\mathrm{CH}_3\right)_3 \mathrm{~N}$ are nucleophiles

$\mathrm{AlCl}_3, \mathrm{NH}_3, \mathrm{SO}_3, \mathrm{NO}_2^{+}, \mathrm{H}_2 \mathrm{O}$ are electrophiles