Question

3. Determine whether the following pair of molecules are representations of the same molecule, or if they are a pair of constitutional isomers. Explain your reasoning. ym 4. Clearly assign priorities for the substituents attached to the marked chirality center in each of the following molecules. (You do NOT need to determine the configuration (R/S). Just assign priorities.) CI I... Br PH2 "NH₂ Br 2. Circle all chirality center(s) in the following molecules. (You do NOT need to determine priorities or the configuration (R/S). Just circle the chirality center(s).) Br Br

Answer 1

Answer)  constitutional isomers

Explanation:

The first molecule is numbered from left to right. It is the longest chain. the longest carbon chain contains 10 carbon atoms therefore the parent chain name is Decane . There are one ethyl substituent at 8 carbon, two methyl substituent at 3rd and 6th carbon and one propyl substituent at 4th carbon atom. Therefore, the IUPAC name is 8-Ethyl-3,6-dimethyl-4-propyldecane.

The second molecule is numbered from bottom to up. It is the longest chain. The longest carbon chain contains 11 carbon atoms. Therefore, the parent chain name is undecane. There are two methyl substituent at 2nd and 5th carbon atom and two ethyl substituent at third and seventh carbon atom , therefore the IUPAC name is 3,7-diethyl-2,5-dimethylundecane.

Both the molecules have different names because of the different connectivity of atoms therefore these molecules are constitutional (structural) isomers. Structural isomers have same molecular formula and different structural formula. Bothe these molecules have molecular formula C17H36 But their structures are different.

Therefore they are not the same molecule.