10 points!! If u r good at chemistry pls help me!! thanks. Which of the following structures are isomers??

Question

which of the following structures are isomers:

A. CH3-CH2-CH(CH3)-CH2-CH3

B. CH3-CH(CH3)CH(CH3)-CH3

C. CH3-CH(CH3)-CH(CH3)-CH2-CH3

D. CH3-C(CH3)(CH3)-CH2-CH3

E.This one is ring and the name is cyclohexane. it is without any side chain.

I am confysed are rings or cyclic isomers too or they are different.

thanks in advance

Answer 1

above is correct A,B,D are isomers, 6 C & 14H.  Cyclohexane has only 6C and 12H, so it its not.  Isomer means the same number of C's and H's.

Answer 2

An isomer has the same number of atoms

BUT

the actual structures are DIFFERENT.  'The way they are put together is different too.'

For example,

(A) has 6 C and 14 H and the 3rd carbon atom has a methyl group on it.

(B) has 6 C and 14 H but carbons 2 AND 3 have methyl groups.

(C) has 7 C and 16 H and carbons 2 and 3 have methyl groups.

(D) has 6 C and 14 H and carbon 2 (only) has 2 methyl groups on it.

(E) has 6 C and 12 H in a circle.  Therefore the two carbons on the end are joined to each other AND not H's.  Rings are circles or 'cyclic.'

NOTE: that E has a DIFFERENT number of atoms AND is a different structure therefore IS NOT and isomer to any of the others.

You might have to take an accounting of all the atoms like I did and check the placement of the atoms.

Hope that helps,

Answer 3

A B & D have same molecular formula  C6 H14 ,and different structures hence isomers, however structure C is not as it has 7 carbons

Answer 4

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