What are 3 isomers of C2H2Br2?

Answer 1

There are numerous possible constitutional isomers of bromopentane. Specifically, the bromine atom can be attached to any of the carbon atoms (although there are only three unique possibilities because the 2 end carbons are identical). So you could have:

• 1-bromopentane (same molecule as 5-bromopentane, but lower number is used)
• 2-bromopentane (same molecule as 4-bromopentane, but lower number is used)
• 3-bromopentane

Then you can also have different connectivity between the carbon atoms. So pentane can either be normal pentane (5 carbons in a row), or it can be a branched structure. There are two possible branched structures for pentane: 2-methylbutane ("isopentane") and 2,2-dimethylpropane ("neopentane").

For 2-methylbutane the possibilities are:

• 1-bromo-2-methylbutane
• 2-bromo-2-methylbutane
• 2-bromo-3-methylbutane (bromine takes precedence and gets the lower number)
• 1-bromo-3-methylbutane

Finally, there's only one possibility for 2,2-dimethylpropane, since the four methyl groups are equivalent and the central carbon is already bonded to four other things:

• 1-bromo-2,2-dimethylpropane

Answer 2

1,1-dibromobutane

1,2-dibromobutane

1,3-dibromobutane

1,4-dibromobutane

2,2-dibromobutane

2,3-dibromobutane

1,1-dibromo-2-methylpropane

1,2-dibromo-2-methylpropane

1,3-dibromo-2-methylpropane

Answer 3

The carbon and the hydrogen remain the same, but the bromine can be moved around to various different positions on the molecule. Bromine replaces one hydrogen atom in C5H12 to give this compound, and you get to choose various hydrogen atoms to replace.

Answer 4

cis-1,2-dibromoethene trans-1,2-dibromo ethene 1,1-dibromo ethene

Answer 5

pentane

2-methyl butane

2,2-dimethyl propane

Answer 6

ch3ch2ch2ch2ch2br

Answer 7

bromopentane