The torsional strain of a pair of eclipsing C-C bonds in cyclopentane is the same as the torsional strain of a pair of eclipsing C-H bonds. How much strain (in kcal/mol) is relieved on ring puckering from flat cyclopentane to the envelope conformation, if the angle strain for both conformations is negligible? Select one: Ⓒa. 2.5 b. 3.0 O c. 5.5 O d. 8.5 O e. 10.5

The torsional strain of a pair of eclipsing C-C bonds in cyclopentane is the same as the torsional strain of a pair of eclipsing C-H bonds. How much strain (in kcal/mol) is relieved on ring puckering from flat cyclopentane to the envelope conformation, if the angle strain for both conformations is negligible? Select one: Ⓒa. 2.5 b. 3.0 O c. 5.5 O d. 8.5 O e. 10.5

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter3: Organic Compounds: Alkanes And Their Stereochemistry

Section3.SE: Something Extra

Problem 52AP: Increased substitution around a bond leads to increased strain. Take the four substituted butanes...

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Concept explainers

Alkanes and Cycloalkanes

Alkanes are saturated organic compounds which are made up of C and H atoms. Alkanes have the general formula of CnH2n+2. Alkane contains sp3 hybridized carbon atoms with four sigmas (σ) bonds & every hydrogen atom is connected with one of the carbon atoms. The size of the alkane could be determined by the number of carbon atoms located in it.

Question

The
torsional strain of a pair of eclipsing C-C bonds in cyclopentane is the same as the torsional strain of a pair of eclipsing C-H bonds. How much strain (in kcal/mol)
is relieved on ring puckering from flat cyclopentane to the envelope conformation, if the angle strain for both conformations is negligible?
Select one:
Ⓒa. 2.5
b. 3.0
O c. 5.5
O d. 8.5
O e. 10.5

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