multiple chioce question (1 Viewer)

[blackratpoo]

A chemist observed a colour change after adding bromine water, Br2(aq), to an
unknown hydrocarbon.
Which one of the following substances could she have produced in this reaction?
(A) pentane
(B) 2-pentene
(C) 2,3-dibromopentane
(D) 1,3-dibromopentane

Answers say (c). Why? I would think only alkENES would do this but this textbook has never been wrong and is very reliable but maybe its a first. anyone have any idea why it could be (c)?:jaw:

 

[ilikebeeef]

It shouldn't be. It should be b.

 

[thongetsu]

maybe you typed question wrong or the book is wrong, a typo?

 

[nonsenseTM]

doesn't pentene react with Br2(aq) by breaking the doulble bond and then PRODUCE dibromopentane?

 

[blackratpoo]

doesn't pentene react with Br2(aq) by breaking the doulble bond and then PRODUCE dibromopentane?

Yes, someone elaborate on this train of thought. Cause, if you read the questioin it says "produces" not "what reacts"

 

[Trebla]

doesn't pentene react with Br2(aq) by breaking the doulble bond and then PRODUCE dibromopentane?

This.

Also, answer is not d) because the double bond that ends up reacting must obviously be between two neighbouring carbon atoms

 

[Lukybear]

I thought it was BrOH that reacted with alkenes?

 

[Pwnage101]

I thought it was BrOH that reacted with alkenes?

According to the 2008 HSC markers (http://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2008exams/pdf_doc/chemistry-notes-08.pdf, page 21), either is acceptable.