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Distinguishing Different Formulas

Examine the following structural formulas and select those pairs that satisfy the following conditions:
Be sure to enter at least two letters in each answer box, unless you select H. Do not enter superfluous characters, since they will be counted as incorrect answers.

A
C2H5CH=CHCH3
B
(CH3)2C=CHC2H5
C
(C2H5)2C=CH2
D
CH3CH=C(CH3)C2H5
E
(CH3)2CHCH=CHCH3
F
(C2H5)2C=CHCH3
G
(CH3)2CHC(CH3)=CH2
H
No formulas fit
this condition.

Which are identical in all respects? .........
Which are constitutional isomers? ...........
Which are capable of stereoisomerism? ..
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