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Chemistry > Alcohols, Phenols & Ethers > Flashcards

Alcohols, Phenols & Ethers Flashcards

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1
Q

Catechol and Resorcinol are which type of isomers?

A

Position isomers (dihydric; two OH groups attached to benzene ring)

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2
Q

Lucas reagent is?

A

Conc. Hcl and ZnCl2

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3
Q

The C-OH bond angle in alcohols is

A

108.5 (slightly higher than water)

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4
Q

Methyl alcohol pka?

A

15.5

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5
Q

Ethyl alcohol pka?

A

15.9

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6
Q

Sec-propyl alcohol pka?

A

16.3

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7
Q

Ter-butyl alcohol pka?

A

17

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8
Q

Which reagent used when SOCl2 reacts with alcohol?

A

Pyridine

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9
Q

Alcohol with concentrated h2so4 at higher temperature 170 C gives

A

Alkenes (dehydration)

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10
Q

Bond angle in ether

A

110.5

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11
Q

Alcohol with conc h2so4 at lower temperature 140 C forms

A

Ethers by dehydration

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12
Q

Which two ethers exist as gases at room temp?

A

Dimethyl ether and ethyl methyl ether

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13
Q

Which ether used as solvent in wurtz and grignard reactions

A

Diethyl ether

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14
Q

Why are ethers less reactive

A

Due to the stability of C-O bond

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15
Q

Ethers are chemically

A

Weak bases due to lone pairs of o atom

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16
Q

Ethers react with strong acids to form

A

Oxonium salts

17
Q

Oxonium salts of ethers are stable if

A

Acid is concentrated

18
Q

Oxonium salts upon dilution with water form

A

Acid and ether

19
Q

Water is stronger ______ than ether

A

Lewis acid

20
Q

Catechol?

A

1,2

21
Q

Resorcinol

A

1,3

22
Q

Hydroquinone

A

1,4

23
Q

Pyragallol

A

1,2,3

24
Q

Geometry of phenol?

A

Bent and slightly distorted than a regular tetrahedron

25
Q

Physical state of phenol?

A

White crystalline solid

26
Q

Phenol may appear which colour due to presence of impurities

A

Red

27
Q

Nature of phenol?

A

Toxic and corrosive

28
Q

In Dow’s process, phenol is prepared from

A

Chlorobenzene using NaOH at 350 and 150 atm

29
Q

In sulphonation of phenol reagent and temp?

A

Na2SO3 at 350 C

30
Q

Picnic acid is

A

Trinitrophenol

31
Q

Oxidation of phenol produced

A

Yellow coloured conjugated diketone called benzoquinone

Chemistry (2 decks)

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