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Exam practice > Topic c > Flashcards

Topic c Flashcards

1
Q

What does a tertiary alkyl halide proceed with

A

SN1 reaction

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2
Q

Explain the mechanism for a SN1 reaction

A

bromine bond broken to form carbocation
H20 attacks positive carbon
the bromine as nu takes a H to become hbr
bond between o-h broken

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3
Q

What reagent from ester to carboxylic acid

A

NaOH and HCl

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4
Q

reagent to prepare carboxylic acid from an alcohol

A

Cr03 and H2SO4

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5
Q

reagent for carboxylic acid to ester

A

conc H2SO4

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6
Q

reagent for ester to alcohol

A

LiAlH4

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7
Q

Why would one carbocation be more stable than another

A

Resonance effect
more stable due to distributing charge across the whole molecule.

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8
Q

Why would a molecule be a stronger base

A

no resonance as bonds are free , weaker bases have resonance effects

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9
Q

Bronsted acid

A

proton donor

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10
Q

bronsted base

A

proton acceptor

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11
Q

With oxo acids which would be a stronger acid

A

Has resonance effects so if an h is removed can stabilise molecule through this effect

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12
Q

Why does a strong acid not have a strong conjugate base

A

Because the proton fully dissociates

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13
Q

Does a strong acid have a negative pKa value

A

yes

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14
Q

Why is the second proton of diprotic acid harder to lose than the first

A

stronger attraction with a negative ion and positive molecule made from the first proton being lost

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15
Q

Why are only 3 steps shown for en

A

This is becuase it is a bidentate molecule and 3x en makes an octahedral shape

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16
Q

Why do the stepwise formation constants decrease for each successive step in both reactions

A

Substitution gets progressively more difficult as there are fewer water
ligands left to replace, so substitution becomes statistically less likely after
each step

17
Q

reagent aldehyde to alcohol

A

CH3LiBr and H+

18
Q

ketone to alcohol

A

LialH4

19
Q

more nodes

A

higher energy

20
Q
A
21
Q

Big K

A

The EQM lies to the right therefore more product

22
Q

Negative log K

A

Equilibrium shifts left as the forward reaction is thermodynamic ally unfavourable so stops stepwise

Exam practice (2 decks)

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