Alcohols, Phenols and Ethers Test

Result

Alcohols, Phenols and Ethers Test - 4

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Weekly Quiz Competition

Question 1
4 / -1

Which reagent can best distinguishes 3-pentanol and 3-methyl-3-pentanol?

A
I₂/NaOH

B
KMnO₄/NaOH

C
HIO₄

D
CrO₃/H₂SO₄

Solution

Chromic acid oxidises 3-pentanol but does not oxidise 3-methyl-3-pentanol (3°). Hence, 3-pentanol would change colour of chromic acid from orange to blue green but 3-methyl-3-pentanol does not.
Question 2
4 / -1

An organic compound X (C₅H₁₂O) gives effervescence with NaH. X on treatment with acidic CrO₃ solution turns solution to blue-green forming C₅H₁₀O₂. Also X can be resolved into enantiomers. The correct statement regarding X is

A
It is 2-pentanol

B
It is 3-pentanol

C
With HBr, it gives achiral alkyl bromide

D
The oxidation product C₅H₁₀O₂ is achiral

Solution

X is a primary, chiral alcohol.
Question 3
4 / -1

An organic compound C₄H₁₀O (X) on reaction with I₂/red-P give s C₄H₉I which on further reaction with AgNO₂ gives C₄H₉NO₂ (Y). Y on treatment with HNO₂ forms a blue solution which turns to red on making solution slightly alkaline. The possible identity of X is

A
1-butanol

B
2-methyl-1-pentanol

C
2-butanol

D
Either (a) or (b)

Solution

X must be a primary alcohol as indicated by Victor Meyer's test. Both (a) and (b) are primary satisfy the condition.
Question 4
4 / -1

An organic compound X (C₇H₁₆O) on treatm ent with concentrated HCI solution forms immediate turbidity even in the absence of ZnCl₂. Also, X is resolvable into enantiomers. The correct statement concerning X is

A
It is 3-methy!-2-hexanol

B
It turns orange CrO₃/H₂SO₄ solution green

C
It is 3-methyl-3-hexanol

D
It forms yellow precipitate with I₂/NaOH

Solution
Question 5
4 / -1

Which reagent given below does not produce any visible change when added to ethylene glycol?

A
NaNH₂

B
CrO₃/H₂SO₄

C
H₂CO/H₂SO₄

D
NaH

Solution

H₂CO forms cyclic acetal with ethylene glycol but the change cannot be observed visually, in all other cases, change can be observed visually-effervescence with NaNH₂ and NaH while colour change with CrO₃ -H₂SO₄.
Question 6
4 / -1

Which of the following is least likely to form turbidity with HCI in the presence of ZnCI₂ at room temperature?

A

B

C

D

Solution

Although it is secondary alcohol, it forms a very unstable carbocation (Cl is electron withdrawing group), hence it does not give turbidity with Lucas reagent in cold condition.
Question 7
4 / -1

The correct statement regarding 3-ethyl-3-hexanol is

A
It changes colour of CrO₃/H₂SO₄

B
It is oxidised on heating with copper metal, producing ketone

C
It gives yellow precipitate with NaOH/I₂

D
It changes colour of cerric nitrate [Ce(NO₃)₄] from yellow to r

Solution

All alcohols react (1°, 2° and 3°) with cerric nitrate and a colour change from yellow to red is observed.
Question 8
4 / -1

An alcohol has molecular formula C₆H₁₂O X and it gives immediate turbidity with cold, concentrated HCI even in the absence of ZnCI₂. X can also be obtained by treatment of an ether with excess of CH₃MgBr followed by acid hydrolysis. Hence, the correct statement regarding X is

A
It is 3-methyl-3-pentanol

B
It is 2-methyl-3-pentanol

C
It is 2-methyl-2-pentanol

D
Either (b) or (c)

Solution
Question 9
4 / -1

Benzenediazonium chloride on reaction with phenol in weakly basic medium gives

A
diphenyl ether

B
p-hydroxyazobenzene

C
chlorobenzene

D
Benzene
Question 10
4 / -1

Phenol reacts with bromine in CS₂ at low temperature to give

A
m-bromophenol

B
o-and p-bromophenol

C
p-bromophenol

D
2,4,6-tribromophenol
Question 11
4 / -1

Phenol on reduction with H₂in the presence of Ni catalyst gives

A
benzene

B
toluene

C
cyclohexane

D
Cyclohexanol
Question 12
4 / -1

Dehydration of alcohol is an example of

A
addition reaction

B
elimination reaction

C
substitution reaction

D
redox reaction
Question 13
4 / -1

Passage

An organic compound X (C₉H₁₂O) gives the following reactions :
i. Na - Slow gas bubble formation
ii. Acetic anhydride - Pleasent smelling liquid
iii. CrO₃-H₂SO₄ - Blue-green solution
iv. Hot KMnO₄ - Benzoic acid
v. Br₂-CCI₄ - No decolouration
vi. I₂ + NaOH - Yellow solid is formed
vii. X rotates the plane polarised light

Q. The structure of X is

A

B

C

D

Solution

Also X, has CH₃—CH(OH)—, gives iodoform test and it is chiral.
Question 14
4 / -1

An organic compound X (C₉H₁₂O) gives the following reactions :
i. Na - Slow gas bubble formation
ii. Acetic anhydride - Pleasent smelling liquid
iii. CrO₃-H₂SO₄ - Blue-green solution
iv. Hot KMnO₄ - Benzoic acid
v. Br₂-CCI₄ - No decolouration
vi. I₂ + NaOH - Yellow solid is formed
vii. X rotates the plane polarised light
Q.
If X is treated with HCI in the presence of ZnCI₂, the major product would be

A

B

C

D

Solution

Also X, has CH₃— CH(OH)—, gives iodoform test and it is chiral.
Question 15
4 / -1

An organic compound X (C₉H₁₂O) gives the following reactions :
i. Na - Slow gas bubble formation
ii. Acetic anhydride - Pleasent smelling liquid
iii. CrO₃-H₂SO₄ - Blue-green solution
iv. Hot KMnO₄ - Benzoic acid
v. Br₂-CCI₄ - No decolouration
vi. I₂ + NaOH - Yellow solid is formed
vii. X rotates the plane polarised light
Q.
An isomer of X, Y was also found to be optically active. It showed the same reactions as X except (vi). Hence, Y is

A

B

C

D

Solution

Also X, has CH₃—CH(OH)—, gives iodoform test and it is chiral.

does not give iodoform test but gives all other reaction similar to X.
Question 16
4 / -1

The compound obtained by the reaction of ethene with diborane followed by hydrolysis with alkaline H₂O₂ is

A
ethanol

B
propanol

C
triethyl bromide

D
None of these
Question 17
4 / -1

Which of the following is formed when phenol is exposed to air?

A
o-Benzoquinone

B
p-Benzoquinone

C
Phenoquinone

D
o-and p-Benzoquinone
Question 18
4 / -1

Which of the following is formed when glycerol is heated with oxalic acid at 503K?

A
Glyceric acid

B
Acrolein

C
Allyl alcohol

D
Methanoic acid
Question 19
4 / -1

The alcohol which does not react with Lucas reagent is

A
isobutyl alcohol

B
n-butanol

C
tert-butyl alcohol

D
sec-butyl alcohol