a) Enantiomers have different melting points b) Solid diastereomers can be separ

ID: 780711 • Letter: A

Question

a) Enantiomers have different melting points

b) Solid diastereomers can be separated by fractional crystallization on the basis of their different solubility in a given solvent.

c) R enantiomers are always levorotatory

d) A molecule with two stereocenters will always be optically active

e) 50/50 mixtures of R and S enantiomers are called racemic mixtures.

f) meso isomers rotate the plane of plane polarized light

g) 2-methyl-1-butanol is a secondary alcohol.

h) An SN1 mechanism is more likely in water than in ethyl ether.

i) If (R) 2-bromobutane were to undergo an SN2 nucleophilic substitution reaction with CH3O- the product would rotate plane polarized light.

j) I- is considered a strong electrophile

EXPLAIN or no rating.

a) False. All the enantiomers will have same physical properties.

b) True. Diasteromers will have different physical properties.

c) False. There is no correlation between R and leavo rotation.

d) False. Some times the molecule having two stereo centres could be meso also, provided the two stereocentres having different configuration.

e) True.

f) False. For meso compounds net there will be no net rotation of plane polarized light.

g) Flase. It is a primary alcohol.

h) True. SN1 reactions favous polar solvents.

i) True. The product in this reaction is (S)-2-methoxybutane, which is optically active and it will rotate plane polarized light.

j) False. I- is a good nucleophile and leaving group.

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