Propane is dichlorinated. How many structural isomers of C3H6Cl2 can form (stereoisomers not counted)?

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Propane is dichlorinated. How many structural isomers of $C X_{3} H X_{6} Cl X_{2}$ can form (stereoisomers not counted)?

Answer: D

Position pairs: 1,1- ; 1,2- ; 1,3- ; 2,2-. (2,3 is the same as 1,2 and 3,3 the same as 1,1.) Total 4, matching the result from substituting every H twice and de-duplicating.

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Propane is dichlorinated. How many structural isomers of CX3​HX6​ClX2​ can form (stereoisomers not counted)?

Answer: D

More questions on Counting structural isomers

Propane is dichlorinated. How many structural isomers of $C X_{3} H X_{6} Cl X_{2}$ can form (stereoisomers not counted)?