NEET · Chemistry · STD 11 - 9. Hydricarbon

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is

A the eclipsed conformation of ethane ismore stable than staggered conformation even though the eclipsed conformation has torsional strain
B the staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain
C the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain
D the eclipsed conformation of ethane is more stable than staggered conformation, because eclipsed conformation has notorsional strain.

Verified Solution

Answer & Solution

Correct Answer

(B) the staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain

Step-by-step Solution

Detailed explanation

Magnitude of torsional strain depends upon the angle of rotation about \(\mathrm{C}-\mathrm{C}\) bond. Staggered form has the least torsional strain and the eclipsed form has the maximum torsional strain. So, the staggered conformation of ethane is more stable than the eclipsed conformation.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Match the interhalogen compounds of \(column-I\) with the geometry in \(column-II\) and assign the correct code.

Column \(I\)	Column \(II\)
\((A) \,XX '\)	\((i)\) \(T-\)shape
\((B)\,XX'_3\)	\((ii)\) Pentagonal bipyramidal
\((C)\,XX '_5\)	\((iii)\) Linear
\((D)\,XX '_7\)	\((iv)\) Square pyramidal
	\((v)\) Tetrahedral

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Match the items given in Column \(I\) with those in Column \(II\) and select the correct option given below:

Column \(I\) \((Function)\)	Column \(II\) \((Part of Excretory System)\)
\((a)\) Ultrafiltration	\((i)\) Henle’s loop
\((b)\) Concentration of urine	\((ii)\) Ureter
\((c)\) Transport of urine	\((iii)\) Urinary bladder
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