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Chemistry > Stereochemistry > Flashcards

Stereochemistry Flashcards

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1
Q

What dimension is a tetrahedron molecule and how many atoms is the cargon atom connected to

A

3D and 4 atoms

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2
Q

How many atoms is a carbon atom in a plane molecule connected to, what dimension is it and describe its bonds

A

Carbon atom connected to 3 atoms including one double bond (2D)

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3
Q

How many atoms is a carbon atom connected to in a line molecule , describe its Bonds and what dimension is it

A

Carbon atom connected to 2 atoms including one triple bond (1D)

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4
Q

Define structural isomers

A

Same molecular formula but different attachment of atoms

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5
Q

What is it called when molecules have the ability to exist in different arrangements due to the rotation of single bonds?

A

Conformers- doesn’t occur in double bonds

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6
Q

What does cis mean?

A

Facing eachother

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7
Q

What does trans mean?

A

Farthest away from eachother (opposite)

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8
Q

Where do you put the cis/trans in the molecule name?

A

At the front

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9
Q

When do you not need to use Cis/trans?

A

When there is one 1 substituent and when 2 substituents are on the same carbon

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10
Q

What does Z mean in Cahn-Ingold-Prelogs system?

A

Together

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11
Q

What does E mean in Cahn-Ingold-Prelogs system?

A

Opposite

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12
Q

What does it mean if an object is chiral?

A

An object is chiral if it is not superimposable on its mirror image

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13
Q

What is a stereoisomer?

A

When molecules have the same Honda but different 3D arrangements

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14
Q

Is methane chiral? (Tetrahedral)

A

No

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15
Q

What is a stereogenic atom? (Chiral centre)

A

A molecule that is connected to 4 different groups of atoms which creates a chiral centre in the molecule (asymmetric carbon atoms or chiral centres)

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16
Q

Can chiral centres have double or triple bonds

A

No

17
Q

If there is a line of symmetry , is the molecule chiral or achiral?

A

Achiral

18
Q

What letters are used to identify absolute configuration?

A

R and S

19
Q

What direction does order of priority go in if the stereogenic atom’s absolute configuration is ‘R’?

A

Clockwise

20
Q

What direction does order of priority go in if the stereogenic atom’s absolute configuration is ‘S’?

A

Anti clockwise

Chemistry (2 decks)

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