Isomerism Rocks

Define chirality centre

• also known as chiral carbon

• a type of enantiomer

• a sp3 hybridised carbon with four different groups or atoms attached to it

• optically active compounds

Can enantiomer rotates plane-polarised light?

• Yes in all situations

• No because it is optically active

• Yes but it can only rotate the polarised light in opposite direction

• No due to its restricted rotation of carbon-carbon double bond

Can 2-cyanopentane exists as a pair of enantiomers?

• Yes,because it is a electrophlie.

• No,it is not an optical isomer.

• Yes,because it contains a chiral carbon bonded to four different atoms or groups.

Choose the possible structures of 2-methylbutanoic acid.

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Explain why hexane exhibits cis-trans isomerism

• There is restriction in the rotation of carbon-carbon double bond.

• Have same atom or group in the same side.

• No mirror image

• There is restriction in the rotation of carbon-carbon single bond in cyclic structure.

State the possible type of stereoisomerism shown by 2-hydroxy-3-pentane

• Diastromer

• Enantiomer

• Both

Is it true that enantiomer have the same physical and chemical properties?

• Yes

• False

Classify the following pair of molecules which are diastromers

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