The compound KSCN is a source of thiocyanate ion.(a) Write the two most stable Lewis struc...

The compound KSCN is a source of thiocyanate ion.

(a) Write the two most stable Lewis structures for thiocyanate ion and identify the atom in each that bears a formal charge of −1.

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(b) Two constitutionally isomeric products of molecular formula C₅H₉NS were isolated in a combined yield of 87% in the reaction shown. (DMF stands for N,N-dimethylformamide, a polar aprotic solvent.) Suggest reasonable structures for these two compounds.