O Levels Chemistry Question – Organic Chemistry (Isomers in Hydrocarbons)

05 Jul

Posted by: sean in: Chemistry Notes & Tips

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Hey students,

Let’s check out a question on Isomerism in Hydrocarbons. Ten Years Series has a couple of questions similar to this one adapted from a top secondary school in Singapore.

PS: Do think through it and leave your suggested answers in the “Comments” section right below this post.

Question:

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6 Responses

Jen
05|Jul|2008 1

Hi.

My answer would be C

A is out as there is the double C=C bond
B and D do not have the same molecular formula

Reply
sean
09|Jul|2008 2

Formally, Isomers are defined as substances that have the same chemical / molecular formulae but different structural formulae.

In the question above, MTBE has chemical formulae as C5H12O.

chemical formulae of the choices:
A) C5H10O
B) C4H10O
C) C5H12O
D) C5H10O

So the answer must be (C).

Cheers
Sean
Founder & Master Trainer
SimpleChemConcepts.com

Reply
waleedbinqasim
07|Nov|2009 3

must be see counting no. of H is enough

Reply
waleedbinqasim
07|Nov|2009 4

C

Reply
myrna walters
05|Jun|2010 5

A is out because of the double bond (=),
B only has 4 carbon molecules,
D only has 9 hydrogen molecules, therefore the answer is
C 5 carbons, 12 hydrogens and 1 oxygen as the compound MTBE

Reply
myrna Reply:
June 5th, 2010 at 1:57 am
A is out because of the double bond (=)
B only has 4 Carbon molecules
D only has 9 Hydrogen molecules, therefore the answer is C – 5 Carbons, 12 Hydrogens and 1 Oxygen as the compound MTBE

Reply