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The structural isomers for C4H6 are:
1. 1-Butyne: CH≡C-CH2-CH3
2. 2-Butyne: CH3-C≡C-CH3
3. 1,2-Butadiene: CH2=CH-CH=CH2
4. 1,3-Butadiene: CH2=CH-CH2-CH=CH2
Note that there are also geometric isomers (cis and trans) possible for 1,2-butadiene.