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.

Solution

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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