organic chemistry

Question 1

intermolecular force in benzene ring

Answer 1

induced dipole

Question 2

Explain why polyesters normally biodegrade more readily than polyalkenes. /1

Answer 2

C-C bond are non polar

Question 3

Describe and explain the shape of benzene. /3

Answer 3

carbon atom angle = 120

carbons are sp2 hydridised

contains delocalised electrons in the pi bonds

(sp2 orbitals) overlap end-on-end form sigma bonds

a p orbital (from each carbon atom) overlaps sideways, forming Pi bonds

Question 4

Suggest one disadvantage of producing two enantiomers in this synthesis. /1

Answer 4

need to seperate the optical isomers to form pure active isomer

lower yield of desired molecule

Question 5

Suggest a method of adapting the synthesis to produce a single enantiomer. /1

Answer 5

chiral catalyst OR use of an enzyme

Question 6

State the uses of TMS and D2O in NMR spectroscop

Answer 6

TMS- reference
D2O- solvent

Question 7

Explain why condensation polymers normally biodegrade more readily than addition polymers?
/1

Answer 7

Addition polymers do not hydrolyse