14. Which of the following compounds is/are chiral? a. methylcyclohexane d. two

Question

14. Which of the following compounds is/are chiral? a. methylcyclohexane d. two of these are chiral b. 2.3-dimethylhexane e, all ofthese o, chine 15. What is the relationship between the structures below? c.cis-1.3-diethyicyclopertan CH, HO b. different conformers of the same compound a. structural (constitutional) isomers c. enantiomers d. diastereomers, e. different, non-isomeric compounds 16. Which reaction or step below would be the most exothermic? d. 17. What is the relationship between the two structures shown below? and H-C-C c. configurational isomers a. identical (or conformers) b. constitutional isomers d. different, non-isomeric compounds 18. Which structures below represent the lowest and highest energy conformers (owest, highest E)? I is highest, Ill is lowest b. I is highest, Il is lowest c. IlIl is highest, I is lowest d. I is highest, Il is lowest

Explanation / Answer

The first one is formation of tertiary butyl carbocation and the second one is formation of free radical. carbocation formation and free radical formation are usually endothermic reactions. The last option in question 16 i.e. (d) is the reation between carbocation and chloride ion, as it is a reaction between opposite charges , the reaction is exothermic.

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