1. In a carbon radical the unpaired electron resides in which orbital?
2. In the most stable conformation of cis-dimethylcyclohexane how many hydrogen atoms are in the axial position?
3.Which of the following have the LOWEST heat of combustion per CH2 group?
a.Cyclopentane b.cyclobutane c.cyclopropane d.cyclohexane
Ans 1) The three bonds in a carbon radical have trigonal planar geometry, and therefore the C is sp2-hybridized with the unpaired electron occupying the perpendicular, unhybridized 2pz orbital. See the image.
Ans 2) Please find the attached image. (after ans 3)
Ans 3) In small-ring cyclic compounds ring strain is a major contributor to thermodynamic stability and chemical reactivity due to angle and eclipsing string in the ring. So from the following values mentioned in the attached image, cyclohexane has the lowest value of heat of combustion due to no ring strain.
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