Organic chemistry: Cyclic Hydrocarbons

#1. (3) Cyclopentane and cyclohexane are stable compounds.

a)Because the angles between bonds near to 60 so the overlapping between orbitals become more strong forming strong sigma bonds

b)Because the angles between bonds near to 109 so the overlapping between orbitals become more weak forming strong sigma bonds

c)Because the angles between bonds near to 109 so the overlapping between orbitals become more weak forming strong sigma bonds

d)Because the angles between bonds near to 109 so the overlapping between orbitals become more strong forming strong pi bonds

#2. (4) Normal propane is less active than cyclopropane.

a)Due the small angles between bonds in cyclopropane that leads to weak overlapping between orbitals forming weak bonds between carbon atoms so it is very active

b)Due the large angles between bonds in cyclopropane that leads to weak overlapping between orbitals forming weak bonds between carbon atoms so it is very active

c)Due the small angles between bonds in cyclopropane that leads to strong overlapping between orbitals forming weak bonds between carbon atoms so it is very active

d)Due the small angles between bonds in cyclopropane that leads to weak overlapping between orbitals forming strong bonds between carbon atoms so it is very active

#3. (5) The reaction of nitrobenzene with chlorine doesn't form ortho-chloronitrobenzene

a)-because nitro group directs to Meta position

b)-because nitro group directs to ortho position

c)-because nitro group directs to para position

d) a and b

#4. (6) Identification of the structural formula of benzene took several years.

a)-Because benzene reacts by addition and substitution and the bond length between carbon atoms are intermediate between the length of single aond and the length of double bonds

a)-because benzene reacts by oxidation and substitution and the bond length between carbon atoms are intermediate between the length of single aond and the length of double bonds

a)-because benzene reacts by addition and substitution and the bond length between carbon atoms are intermediate between the length of triple bond and the length of double bonds

a)-because benzene reacts by reduction and substitution and the bond length between carbon atoms are intermediate between the length of single aond and the length of double bonds

Organic chemistry: Cyclic Hydrocarbons – Quiz 8

Results

#1. (3) Cyclopentane and cyclohexane are stable compounds.

#2. (4) Normal propane is less active than cyclopropane.

#3. (5) The reaction of nitrobenzene with chlorine doesn't form ortho-chloronitrobenzene

#4. (6) Identification of the structural formula of benzene took several years.