The C-C bond is a single bond and has free rotation about it. Arrange the ethane

Question

The C-C bond is a single bond and has free rotation about it. Arrange the ethane so each C-H bond on one C atom is exactly parallel to a C-H bond on the second C atom. (This is the eclipsed position.) View this arrangement by looking along the C-C bond such that the atoms on the front C blank out those on the back C. From this view the model is represented as in I (a Newman projection.) molecule that H2 Hs Ha Ha H1 Front carbon carbon60 rotation 60° rotation Ho H2 H3 Now rotate the front carbon 60 degrees clockwise producing II. Which of the above arrangements allows more space per atom? Which arrangement would you expect to be more stable? IH2C-C2C Make a model of 1,2-dichloroethane by replacing an H atom with a CI a ke a model of 1,2-dichloroethane by replacing an H atom with a CI atom on each C in your ethane model. Use a different color rod to show the Cl atoms. The eclipsed Newman projection is given in I. Rotate the back C2 by 60 degrees and show the result on II, rotate another 60 degrees and show the result on III, etc., until you have completed a 360 degree rotation about the front C. Remember that a Cl atom is much larger than an H atom VI

Explanation / Answer

3rd struture is more stable.It is gauch Conformation.inthis conformation steric repulsion is very less.heavier Group are 180 degree away.

1st structure is east stable

because steric repulsion is more.bukier group are very close to each other

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