1) Which of the following is a wedge and dash projection for the following Newma

Question

1) Which of the following is a wedge and dash projection for the following Newman projection?

2) What is the eclipsing cost of Br and H if the energy difference between the staggered and eclipsed conformations of bromoethane is 13 kJ/mol?

3) Draw the lowest energy conformer of the following compound.

4) Which of the following is the most stable conformer of the most stable isomer of 1-ethyl-2,4-dimethylcyclohexane?

5) Are the two substituents cis, trans, or neither

6)Which is more stable?

Which of the following is a wedge and dash projection for the following Newman projection? What is the eclipsing cost of Br and H if the energy difference between the staggered and eclipsed conformations of bromoethane is 13 kJ/mol? Draw the lowest energy conformer of the following compound. Which of the following is the most stable conformer of the most stable isomer of 1-ethyl-2,4-dimethylcyclohexane? Are the two substituents cis, trans, or neither Which is more stable?

Explanation / Answer

(1) b

(2) Here, we also require eclipsing cost of H-H interaction. let it be x.

eclipsing cost of Br-H = y

In eclipsed there are 2 H-H and Br-H eclipse interaction. But in staggered , no eclipsing confirmations. So energy differnece = 13= 2*x + y

In general, x=4 ,So, y= 5.

(3) a

(4) d

(5) trans

(6) B

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