Organic acid and bases Flashcards

1
Q

How do you prepare carboxylic acids?

A
  1. Oxidation of primary alcohol using strong oxidising agent (H2CrO4)
  2. Grignard reagent addition to CO2
  3. Nucleophilic substitution of primary halide with CN then addition of acid
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2
Q

What is the acidity of carboxylic acids?

A

Moderately weak acids

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3
Q

How does acidity of carboxylic acids compare with alcohols?

A

Carboxylic acids are more acidic as the carboxylate anion is more stable due to spread of charge across partial positive C due to C=O bond

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4
Q

How does the acidity of a parent acid relate to the stability of the conjugate base?

A

More stable conjugate base = stronger acid = lower pKa

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5
Q

How do electron donating substituents affect the strength of acids?

A

Electron donating groups decrease the stability of the conjugate base making the acid weaker

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6
Q

How do electron withdrawing substituents affect the strength of acids?

A

Electron withdrawing substituents stabilise the conjugate base making the acid stronger

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7
Q

What is resonance stabilisation?

A

stabilisation of an ion due to delocalisation e.g. phenols

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8
Q

How does the acidity of phenols compare to carboxylic acids and alcohols?

A

The phenoxide ion is more stable than the alkoxide ion but less stable than the carboxylate anion therefore

Carboxylic acid > Phenol > Alcohol

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9
Q

How do EWG and EDG affect acidity of phenols?

A

The more delocalised a charge is the more stable and the more stable the conjugate base the more stronger acid

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10
Q

Are amines acidic or basic?

A

Amines are basic as they can use lone pair to accept protons

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11
Q

Are anilines acidic or basic?

A

They are basic but much less compared to amines because their lone pair is delocalised into the ring making it less available

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12
Q

Are amides acidic or basic?

A

Neutral

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