The least stable conformation of cyclohexane is the: A) boat. B) twist boat. C)

Question

The least stable conformation of cyclohexane is the: A) boat. B) twist boat. C) chair. D) half-chair. E) twist chair. which conformation represents the most stable conformation of cis-1- tert-butyl-4-methylcyclohexane? According to R-S convention, which priority is correct for the following sets of groups? A) NH2 > CI > CH3 > H B) CI > NH2 > CH3 > H C) CI > CH3 > NH2 > D) H > Cl > CH3 > NH3 E) CH3 > NH2 > Cl > H How many chiral stereoisomers can be drawn for CH3CHClCHBrCH3? A) 1 B) 2 C) 3 D) 4 E) 8

Explanation / Answer

ANS- C
The most stable conformation is that of CHAIR because it is sterically least hindered.

ANS- D
The same reasoning is applied to the next question and we can say IV is most stable

The t-Bu and Me groups point away from each other and the cycohexane ring making it most stable

ANS- A
The answer for the 3rd question is evidently A.
Since that is the convention chosen for R and S nomenclature. The list has to be memorized and there is no other
alternative for students.

ANS- D
The answer for the last question is 4
Since R and S configuration is possibe on both 2nd and 3rd carbons giving us the combinations
R R
R S
S R
S S

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