how could the following compounds be synthesized from acetylene? compound a is ch3ch2ch2cch, with a triple bond between the fourth (from left to right) and the fifth carbons. compound b is ch3chch2, with a double bond between the second (from left to right) and the third carbons. compound c has a structure of a cc double bond in its structure, with a ch3 group attached to both carbons above and an h atom attached to both carbons below the double bond. compound d is ch3ch2ch2ch2ch, with an o atom double-bonded to the fifth (from left to right) carbon. compound e is ch3chch3, with a br atom attached to the second carbon. compound e is ch3cch3, with two cl atoms attached to the second carbon.