Questions: The most and least stable conformations of ethane are shown. Conformer A in which the C-H bonds on one carbon bisect the H-C-H bond angle on the adjacent carbon is called a conformation. B is the conformation, in which the C-H bonds of one carbon are directly aligned with the C-H bonds on the adjacent carbon.

The most and least stable conformations of ethane are shown. Conformer A in which the C-H bonds on one carbon bisect the H-C-H bond angle on the adjacent carbon is called a conformation. B is the conformation, in which the C-H bonds of one carbon are directly aligned with the C-H bonds on the adjacent carbon.
Transcript text: The most and least stable conformations of ethane are shown. Conformer A in which the C-H bonds on one carbon bisect the $\mathrm{H}-\mathrm{C}-\mathrm{H}$ bond angle on the adjacent carbon is called a $\square$ conformation. B is the $\square$ conformation, in which the C-H bonds of one carbon are directly aligned with the C-H bonds on the adjacent carbon.
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Solution

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Solution Steps

Step 1: Identify the Conformations
  • Conformer A shows the C-H bonds on one carbon bisecting the H-C-H bond angle on the adjacent carbon. This is known as the staggered conformation.
  • Conformer B shows the C-H bonds of one carbon directly aligned with the C-H bonds on the adjacent carbon. This is known as the eclipsed conformation.
Step 2: Determine Stability
  • The staggered conformation (Conformer A) is the most stable due to minimized electron repulsion between the hydrogen atoms.
  • The eclipsed conformation (Conformer B) is the least stable due to increased electron repulsion between the hydrogen atoms.
Step 3: Fill in the Blanks
  • Conformer A is called the staggered conformation.
  • Conformer B is called the eclipsed conformation.

Final Answer

The most and least stable conformations of ethane are shown. Conformer A, in which the C-H bonds on one carbon bisect the H-C-H bond angle on the adjacent carbon, is called a staggered conformation. Conformer B is the eclipsed conformation, in which the C-H bonds of one carbon are directly aligned with the C-H bonds on the adjacent carbon.

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