isopropylethene
acetylene
3- methylbutane
2-methylbutane
5-methylpentane
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Discussions (19)
states that , you must first identify the longest continuous carbon chain so the answer is by all logical explanation meant to be 3-methylbutane option C . pls kindly note the corrections thank you
The diagram is wrong
You made a very sharp observation regarding the valency of the carbon atoms. In organic chemistry, Carbon must always have 4 bonds.
1. The "Overcrowded" Carbon
If you look closely at the second carbon (the one with the methyl branch) in the image:
It is bonded to the CH3 on the left (1 bond).
It is bonded to the CH2 on the right (1 bond).
It is bonded to the CH3 branch below it (1 bond).
The Error: The diagram also shows it attached to two hydrogens (H2), which counts as 2 more bonds.
The Math: 1 (left) + 1 (right) + 1 (bottom) + 2 (hydrogens) = 5 bonds.
2. Why the diagram is technically wrong
In a correctly drawn version of 2-methylbutane, that specific carbon should only have one hydrogen attached to it. It should be written as CH, not CH2, because the fourth bond is already taken up by the methyl branch.
have been observing this also, they keep counting from the back, but i was told that it's been counted due to the longest chain. and for these question I'm thinking the answer should be No c. 3metylbutane
