2. Which cumulene structure is physically impossible? b. н C. H d. e. not a.-d. a.

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2. Which cumulene structure is physically impossible?

- a. Structure with two double bonds connected, one hydrogen pointing upward, and the other pointing downward.
- b. Structure with two double bonds connected, both hydrogens pointing downward.
- c. Structure with three double bonds, one hydrogen and one substituent pointing into the plane and one hydrogen and substituent coming out.
- d. Structure with three double bonds, both hydrogens pointed inward (opposite directions).
- e. Not a-d.

The problem involves evaluating different structures to determine which cumulene configuration cannot exist due to geometric constraints or stereochemistry issues.
Transcribed Image Text:2. Which cumulene structure is physically impossible? - a. Structure with two double bonds connected, one hydrogen pointing upward, and the other pointing downward. - b. Structure with two double bonds connected, both hydrogens pointing downward. - c. Structure with three double bonds, one hydrogen and one substituent pointing into the plane and one hydrogen and substituent coming out. - d. Structure with three double bonds, both hydrogens pointed inward (opposite directions). - e. Not a-d. The problem involves evaluating different structures to determine which cumulene configuration cannot exist due to geometric constraints or stereochemistry issues.
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