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URGENT A/S Chemistry Org: Reactions & Isomers watch

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    Hi, I am stuck on the following:

    Reduction of a branched alkene A with hydrogen formed a compound B. On analysis, B had the composition by mass of C, 82.8%; H, 17.2% (Mr = 58). Reaction of A with steam in the presence of a catalyst produced a mixture of two isomers C and D.

    Identify possible structures for compounds A-D. Your answer should show all working and include strucutral formulae for each structure and equation for each reaction. [9 marks]

    I have calculated the empirical formula of B = C2H5 and the molecular formula of B = C4H10.
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    Ok, well you've started correctly by working out B, then you have to work backwards for A. As B is Butane, and A is a branched alkene, I think A is methylpropene. Would you agree with that?
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    according to the book, B is (CH3)2CHCH3 I am so confused ! :eek:
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    (Original post by supreme)
    according to the book, B is (CH3)2CHCH3 I am so confused ! :eek:
    Ok sorry I was forgetting A was branched, which makes B methylpropane, but its kinda hard to draw it on here! Have you looked up the reactions of alkenes with steam, which will help you find C and D?
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    Thanks I will look up the reactions and see if I understand
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    If you want I can write it on a piece of paper for you and scan it and post it up here so you can see what the compounds should look like? You should get an alcohol, which has 2 isomers.
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    If you could that would be helpful
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    (CH3)2CHCH3 is the same as C4H10 but (CH3)2CHCH3 is structured. (CH3)2 is branched off the C on the CH part if u get wot i mean!!

    alkenes react with steam to produce alchohols. the catalyst is phosphoric acid. ths process is called direct hydration. so maybe 1 of ur isomers is an alcohol
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    Ok, here it is, i've had to resize it really small so it'll fit as an attachment so you might have to fiddle with it before you're able to read it!

    I haven't included reaction equations on it though.

    If you can't read it I'll make it big and send it to you by email, if you want.
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    Thanks
 
 
 

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