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Answer 1 · 2017-09-06T13:28:00

Yes, you can #H# atoms, add, except...

H atoms can be added to all carbons except, #=C=#, which #C# has already bonded with #4 H# atoms, which means that, #H# can't be added again..

In Organic Chemistry, Carbon, C has the ability to bond with only 4 Hydrogen Atoms, #H..#

#"C = C - C = C - C = C = C - OH"# Where each #= or -# represent the hydrogen Carbon is bonded with..

Also...

For #"C = C"#.... Carbon, #C# has the ability to have only #2 H#, attached to it, since they already have #2 H# each..

Hope you understand!

Answer 2 · 2017-09-06T13:36:26

No. See explanation.

Carbon can make 4 bonds. From those bonds we can see that (counting from left to right):

first atom uses 2, so it can have 2 atoms of hydrogen,
second, third, fourth and fifth use 3 (you count bonds both left and right from the atom), so you can add one hydrogen atom to each carbon,
sixth atom uses four, so you cannot add anything here,
last atom uses 3 bonds, so you can add one hydrogen atom here.

Finally the fomula would be:

#CH_2 = CH-CH=CH-CH=C=CH-OH#