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 f is CH3CCH3, with two Cl atoms attached to the second carbon. Complete the syntheses by dragging the labels to the appropriate targets.