Question

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Select the correct stability order of the conformation /Rotamers / rotational isomers of Ethane molecule?


(a) partially eclipsed > fully eclipsed > anti staggered > skew pr gouche


(b) skew or gouche > partially eclipsed > fully eclipsed > anti staggered


(c) anti staggered > skew or gouche > partially eclipsed> fully eclipsed


(d) fully eclipsed > anti staggered > skew or gouche > partially eclipsed


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Answer 1

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★$<u> Organic Chemistry </u>$★

$<b> Ques.→ Select the correct stability order of the conformation /Rotamers / rotational isomers of Ethane molecule? </b>$

(a) partially eclipsed > fully eclipsed > anti staggered > skew pr gouche

(b) skew or gouche > partially eclipsed > fully eclipsed > anti staggered

(c) anti staggered > skew or gouche > partially eclipsed> fully eclipsed

(d) fully eclipsed > anti staggered > skew or gouche > partially eclipsed.

Solution :-

★Correct Answer :- $<u> Option C </u>$

(c) anti staggered > skew or gouche > partially eclipsed> fully eclipsed.

⚫$<i> <u> Reason - Staggered isomers are more stable due to the unfavourable energy interactions among the eclipsed isomers. </u> </i>$

▪$<b> What are conformation /Rotamers / rotational isomers? </b>$

→ These are the isomers that can be prepared by the free rotation around a single bond !

$<i> Thanks !! </i>$
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Answer 2

Answer:

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