Please help organic ?

Question

what two atomic orbitals overlap to form C-H bond in ethylene

which of the following alkenes has the smallest molar heat of hydrogenation
trans-2-butene
2,3-dimethyl-2-butene
1-hexene
2-methyl-2-butene
cis-2-butene

which of the alkyl chlorides listed below undergowes dehydrohalogenation in the presence of a strong base to give pent-2-ene as the only alkene product
2-chloropentane
1-chloropentane
3-chloropentate
1-chloro-3-methylbutane
1-chloro-2-methylbutane

alkenes...
a) are reasonably soluble in water
b) have lower boiling point than alcohols of similar molecular weight
c) are relatively polar compouds
d) a and b
or none

Answer 1

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Sample answer:

Alkenes... b).

Source(s):

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Answer 2

1) an s and an sp2 orbital

2) 2,3-dimethyl-2-butene; http://www.cem.msu.edu/~reusch/VirtualTe…

3) 3-chloropentane

4) b

Disclaimer, I am the author of the material found at http://www.curvedarrowpress.com and http://www.curvedarrow.com and these mechanisms are present in "A Guide to Organic Chemistry Mechanisms".