The addition of HBr to 1-butyne follows Markovnikov's rule, leading to the formation of 2-bromobutane.

The addition of HBr to 2-pentene follows Markovnikov's rule, leading to the formation of 2-bromopentane.

2,3-dimethylpentane has a total of 7 carbons and 16 hydrogens, giving it the molecular formula C7H16.

Hydrogenation of 1-hexene adds hydrogen across the double bond, resulting in hexane.

The reaction of ethylene (an alkene) with bromine results in the formation of 1,2-dibromoethane through an electrophilic addition mechanism.

1-butene and cis-2-butene are geometric isomers due to the different spatial arrangements around the double bond.

The longest carbon chain has 5 carbons with a triple bond starting at the second carbon, hence the name 2-pentyne.

The longest chain with the triple bond is 5 carbons long, and the triple bond starts at the second carbon, making it 2-pentyne.

The hydrogenation of 1-butyne will fully saturate the triple bond, resulting in butane.