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Is CH3CH2CH2CH(CH3)2 a primary, secondary or tertiary carbon and why?

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5 Answers

Both CH2 (2nd CH2 and 3rd CH2 from left) Has Secondary Carbon atom

There is only 1 CH  and this carbon is Tertiary

All the CH3 Carbons are Primary Carbon atom (1st CH3 and last 2 CH3)

 

Just to chime in, the atom designation increases with the amount of carbon atom bonding.

A primary carbon has one carbon atom bonded to it.

A secondary carbon atom has two carbon atoms bonded to it.

A tertiary carbon atom has three carbon atoms bonded to it.

A quaternary carbon atom has four carbon atoms bonded to it.

First you must look for the longest chain of carbons to correctly determine the configuration. That is five carbons with a methyl group on number 4 so the second methylene group is attached to two other carbons and therefore secondary.

There is one tertiary carbon and the primary carbons are 1, 5 and the methyl group attached to 4.

Art

Ambiguous.  Which carbon are you talking about in this pentane molecule?  There are examples of each here, but which is unclear.

There are 3 1°, 2 2º, and 1 3º carbon here.

Primary (1º) is a carbon with three hydrogens on it.

Secondary (2º) is a carbon with two hydrogens on it.

Tertiary (3º) is a carbon with only one hydrogen on it.