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chemistry > alcohols > Flashcards

alcohols Flashcards

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1
Q

hybridisation of orbitals of carbon and oxygen in Oh group

A

sp3

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2
Q

bond angle in alcohols is slightly less than the tetrahedral angle

A

because of the repulsion between unshared e pairs of oxygen

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3
Q

c-o bond length of phenols is slightly less than methanol

A
  1. partial double bond char
  2. sp2 hybridisation of c to which o is attached
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4
Q

bond angle in ethers is slightly greater than tetrahedral

A

repulsive interactiojs between 2 bulky R groups

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5
Q

phenol is also known as

A

carbolic acid

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6
Q

bp of alcohols and phenols inc with inc in

A

no of R groups

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7
Q

which hydrogen bonding is the OH group involved in

A

intermolecular

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8
Q

solubility of alcohols and phenols decreases with

A

inc in R Groups

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9
Q

acidic nature of alcohols is due to

A

polar OH bond

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10
Q

alcohols or water which are stronger acid

A

water

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11
Q

solubility order of diff types of compounds

A

alcohol>aldehyde=ketone>ether>alkane

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12
Q

alkoxide ion is less stable than phenoxide ion

A

phenoxide ion is resonance stabilised

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13
Q

acetalyation rxn

A

AR-COOH,OH +(CH3CO)2O gives Ar-COOH,OCOCH3 +CH3COOH

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14
Q

gatterman aldehyde synthesis

A

ar-OH+HCl+HCN (alcl3) gives OH,p-CH=NH-Ar (H2O) gives Oh-CHO-Ar

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15
Q

williamson synthesis

A

rx+rona gives ror+nax

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16
Q

williamson synthesis

A

rx+rona gives ror+nax

17
Q

which type of alcohols are yielded on reduction of aldehydes and ketones

A

aldehydes-primary
ketones-secondary

18
Q

rxn of alcohols with grignard reagent

A

methanal-1°
aldehydes-2°
ketones-3°

19
Q

alcohols and protons are?

A

bronsted acids

20
Q

alcohols act as bronsted bases as well
why

A

presence of unshared electrons on oxygen

21
Q

in the rxn of alcohols and phenols with carboxylic acids and acid anhydride, water is removed as soon as its formed. why

A

because the rxn is reversible

22
Q

phenols show c-o cleavage only on rxn with

A

zinc

23
Q

order of ease of dehydration of alcohols

A

3>2>1

24
Q

o and p isomers of nitrophenol can be isolated. how?

A

o isomer is steam volatile due to intramolecular h bonding while p is not due to intermolecular bonding

25
Q

2 4 6 tribromophenol is formed as

A

white ppt

26
Q

denaturation of alcohol

A

commercial alcohol is made unfit by addition of cuso4 and pyridine

27
Q

alkoxy grp is _ directing

A

o, p

28
Q

alkoxy grp is _ directing

A

o, p

chemistry (7 decks)

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