Definitions

Question 1

Anti-addition

Answer 1

An addition reaction in which two substituents are added to opposite sides (or faces) of a double bond or triple bond.

Question 2

Syn-addition

Answer 2

The addition of two substituents to the same side (or face) of a double or triple bond reduces the bond order but increases the number of substituents.

Question 3

Achiral

Answer 3

symmetric in such a way that it can be superimposed on its mirror image; not chiral.

Question 4

Mesocompound

Answer 4

An achiral compound with chiral centres is known as a meso compound & has an internal plane of symmetry that makes it superimposable on its mirror image (is inactive)

Question 5

Enantiomers

Answer 5

non-superposable mirror images (all change)

Question 6

Diastereomers

Answer 6

non-mirrored stereoisomers (not all change)

Question 7

Electrophile

Answer 7

+ charge, low e- density

Question 8

Nucleophile

Answer 8

• charge, high e- density

Question 9

Stereoisomers

Answer 9

compounds differing only in the spatial arrangement of their atoms.

Question 10

Formal charge

Answer 10

FC = V.E. - (# of bonds + # of dots)

Question 11

High electron density (3 eg.)

Answer 11

1. Double bonds
2. Triple bonds
3. Lone pairs

Question 12

Chiral

Answer 12

asymmetric in such a way that the structure and its mirror image are not superimposable.

Question 13

Racemate

Answer 13

50:50 mixture of enantiomers

Question 14

Pure chiral molecule will/wont rotate plane polarised light?

Answer 14

yes. if it cant rotate, it isn’t a pure chiral molecule