Alcohol, Phenol and Ether Test

Result

Alcohol, Phenol and Ether Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

Only One Option Correct Type
Direction (Q. Nos. 1-8) This section contains 8 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Q.
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
1 / -0

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
1 / -0

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
1 / -0

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
1 / -0

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
1 / -0

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
1 / -0

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
1 / -0

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