Answer:
3) C: Structure should have 6 carbon with double beginning on the 2nd carbon atom.
4) D: structure should have 5 carbon with triple bond beginning on the first carbon atom.
5) A: 4
Explanation:
3) The molecular formula for hexene is C6H12. This means it has 6 carbon atoms. However, the suffix "ene", means that it contains an alkene and thus it has 2 double bonds connecting 2 carbon atoms.
Looking at the options, the correct one is Option C.
4) The molecular formula for 1-pentyne is given by; C5H8.
This means there are 5 carbon atoms. However, the suffix "yne" means there is a presence of ethyne and thus it has triple bond.
Looking at the options, the only correct one is Option D
5) Since the number of carbon atoms are 3 and it has triple bond, then it means this is likely propyne
Now, the formula is C3H4 which is;
chemical formula CH3C≡CH
Thus, the number of hydrogen atoms with at least 1 carbon-carbon triple bond is 4.