Drawing Constitutional Isomers of Alkanes - Organic Chemistry 

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I've made this mistake so I wanted to clarify for those looking--adding an ethyl group tends to change the chain. For instance hexane. Adding an ethyl group to the a 3-carbon chain just creates a 4-carbon chain with two methyl groups. It looks different at first glance, but you always want to make sure to recount the longest chain. That being said, for heptane there are nine structural isomers.

in 4:16 should it be named 2,2-dimethylpropane?

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At 4:17 you wrote 2,2-dimethylpentane. Why is it pentane and not propane? You marked 3 carbons on your parent chain

Heptane has 9 isomers , i think you missed 3 carbon with 2 carbons having 2 carbon branch each , correct me if I'm wrong

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7:20 For heptane isnt there the possibility of forming 3- ethylpeptane? Having a five carbon chain with ethyl on the third carbon

is there a general formula to identify the total number of constitutional isomers?

you are missing 3-ethylpentane, the 9th isomer of heptane

You are wrong heptane have 9 isomers but you only write 8 of them, but i admire your work that in great.

thank you so much

Can't we add an ethyl isomer in heptane (3-ethylpentane)?

At 5.32 can we put one group on the top and the other group at the bottom ? rather than two groups on the top ?

are cyclo alkanes consitutional isomer?

heptane has 9 isomers not 8

How come there were any ethyl groups when trying to find the isomers?

Really helpful!! Thank you :-)

The third constitutional isomer of C5H12 is 2,2-dimethyl propane,not 2,2- dimethyl pentane as you have illustrated......nice presentation though

How would you name the 4-carbon isomer for heptane? The C7H16 molecule? I've named the rest for this one...

Heptane forms 9 and octane forms 18 isomers

What about 3 -ethylpentane for c7h16?

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This is amazing thanks mate

4:04 are this 2,2-methyl propane or 2,2-methyl pentane

Th ank you very much.

4:06 isn't it called 2,2-dimethylpropane?

4:19 you meant 2,2dimethylpropane

i thought nomenclature cannot be the same

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Can you speak arbic please

Thank you so much