Write structural formula for 2-butyne

Answer 1

Do you mean phenylpentane? If so then C6H5-CH2-(CHBr)2-CH2-CH3 is one way of writing a structural formula for this compound.

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If you want to draw a Lewis structure from the given name, start with the root: pentane. This is a five carbon chain. in a simple chain like this, you can choose either end to begin numbering your carbons. Number them one through 5. Next, add the groups according to their number in the name: you have two bromines (dibromo) and they are at carbons 2 & 3. At carbon 1 you have a phenyl group... which is just like a benzene ring, minus one hydrogen for where it is attached to your root chain. Now fill in the hydrogens on the pentane chain... enough so that each carbon is bonded to four other atoms, whether they be hydrogens or Bromines or any functional group.

Answer 2

CH3CH2CHBrCH3

Answer 3

Ch3-ch=ch-ch3