What is the most stable conformation of cis -1-sec-butyl-4-methylcyclohexane? Ho

Question

What is the most stable conformation of cis -1-sec-butyl-4-methylcyclohexane? How many axial hydrogens are present in the following molecule? A. two B. three c. four D. five E. six Cyclobutane is an example of a molecule that shows A. only angle strain B. 109.5 degree bond angles C. angle and torsional strain D. only torsional strain E. a low energy ring structure Consider the graph of total strain energy versus ring size. Which of the following statements is false? A. Among the smaller ring sizes, six-membered rings are the most stable. B. Medium-sized rings (7-11 carbons) are less stable than larger rings. C. Five-membered rings have about the same strain energy as seven-membered rings. D Four-membered rings are significantly more stable than three-membered rings. E. Ten-membered rings are the least stable of the medium-sized rings(7-11 carbons). Which of the following definitions most accurately describes stereo-isomers? A. compounds that differ from one another by one bond rotations B. that differ from one another result of differences in spatial orientation that are caused by altering their connectivity (one structure compared with the other) C. compounds that have exactly the same connectivity but differ in the arrangement of their atoms in space D. compounds that are very similar in structure but contain several different functional groups E. compounds that have the same carbon atoms but differ because one of them is acyclic (no ring) and the other (contains a ring) Which one of the following statements is incorrect? A. Cyclopropane has a higher heat of combustion than does cyclohexane. B. Cyclopentane is destabilized somewhat by tortional (eclipsing) interactions. C. Cyclohexane exists predominantly in an all-staggered conformation. D. Cyclopropane is destabilized by both angle strain and tortional (eclipsing) interactions. E. Cyclobutane has a higher heat of combustion per CH_2 group than does cyclohexane.

Explanation / Answer

Ans 1:- Here the most stable confirmation of cis 1,sec butyl 4 methylcyclohexane is option (B) because we know in cis isomers the position of substituent group should be in the same side and here in option (B) , the axial hydrogen and equitorial hydrogen is also in the same side. Therefore option (B) is the most stable confirmation.

Ans 2) Axial hydrogen are always drawn along the axis and here there are four hydrogen present aruond the axis of the given molecule , so the correct option is (C)

Ans 3) Cyclohexane is an example of molecule having bond angle 109.50 because according to valence shell repulsion theory it has a tetrahedral structure in plane as the axial C-C and C_H bond has an angle of 109.5.

Ans 4) Here Option C) i.e Five membered ring has about the same strain energy as seven membered ring is false because seven membered ring has less stable strain energy than five membered ring and as a result the five membered ring molecule can transform itself to any confirmation.

Ans 5) We know stereoisomers are those which have same molecular formula but their arrangement of atom in space is different. Therefore the correct option is C) which describes stereo isomers as compounds that have exactly the same connectivity but differ in the arrangement of their atoms in space.

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