Alcohols, Phenols and Ethers Test

Result

Alcohols, Phenols and Ethers Test - 6

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Weekly Quiz Competition

Question 1
4 / -1

Consider the following reaction,

CH₂ = CH₂ + Cl₂ - H₂O → ClCH₂ — CH₂OH HOCH₂CH₂OH

Q.

The most appropriate reagent X for the above reaction is

A
NaOH(aq)

B
NaHCO₃(aq)

C
NH₃(aq)

D
H₂SO₄/H₂O

Solution

A slightly weaker base (NaHCO₃) is used in the second step S_N2 reaction otherwise oxirane formation would be preferred.
Question 2
4 / -1

Which is the most suitable condition for the following transformation?

A
O₃/Zn - H₂O then NaBH₄

B
CF₃CO₃H then NaBH₄

C
CF₃CO₃H then NaOH(aq)

D
KMnO₄ - NaOH(aq)

Solution

Epoxide, upon hydrolysis in either acidic or alkaline medium gives anti, vicinal diol.
Question 3
4 / -1

What is the increasing order of solubility of the following in water?

A
I < II < III < IV

B
I < III < II < IV

C
IV < III < II < I

D
IV < II < III < I

Solution

Greater the number of hydroxy groups, greater the solubility in water. Between (II) and (III), (III) is slightly less soluble due to greater hydrophobic alkyl fraction.
Question 4
4 / -1

How many different diols product are formed in the following reaction?

A
1

B
2

C
3

D
4

Solution

At planar carbonyl carbons, hydride ion attacks from both sides giving both stereomers. Hence, the product diols would be all stereomers of 2, 3 - butanediol.
Question 5
4 / -1

Which does not form dihalide when treated with ethylene glycol?

A
PCI₃

B
SOCI₂

C
PBr₃

D
PI₃

Solution

(d) PI₃ does not form di iodide with vicinal diols.
Question 6
4 / -1

What is the major organic product of the following reaction?

A

B

C

D

Solution

Both oxirane hydrolysis and halide substitution (S_N2) take place.
Question 7
4 / -1

What is formed as the major product in the reaction given below?

A

B

C

D

Solution
Question 8
4 / -1

The major organic product formed below is

A

B

C

D

Solution

Ethylene glycol on heating with concentrated H₂SO₄ gives 1 , 4-dioxane
Question 9
4 / -1

Which of the following is true statem ent regarding reaction of c/s and trans 2-hexene with CH₃OH/H⁺ ?

A
Both react at same rate

B
C/s isomer reacts faster than trans isomer

C
Both cis and trans isomers give mixture of positional isomers as the major product

D
Both (a) and (c)

Solution

Both cis and trans 2-hexene form s the same carbocation, hence react at same rate.
Question 10
4 / -1

Ethanol is converted into ethoxy ethane,

A
by heating excess of ethanol with conc. H₂SO₄ at 140°C

B
by heating Ethanol with excess of conc. H₂SO₄ at 443 K

C
by treating with conc. H₂SO₄ at room temperature

D
by treating with conc. H₂SO₄ at 273 K

Solution

In order to obtain ethoxy ethane from ethanol, the ethanol must be subjected to the effect of concentrated sulphuric acid at 413 Kelvin or 140°C as shown below:
Question 11
4 / -1

Phenol is acidic due to resonance stabilization of its conjugate base :

A
O-H

B
Benzyl alcohol

C
Alkoxide ion

D
Phenoxide ion
Question 12
4 / -1

One of the constituents of baking powder is sodium hydrogencarbonate, the other constituent is

A
hydrochloric acid

B
tartaric acid

C
acetic acid

D
sulphuric acid

Solution

Baking powder is a mixture of baking soda NaHCO₃,(sodium hydrogen carbonate)and a mild edible acid such as tartaric acid. When baking powder mixes with water (form a king cake or bread), sodium hydrogen carbonate reacts with tartaric acid to evolve carbon dioxide gas.
Question 13
4 / -1

Identify the alcohol or phenol having a stronger acidic nature from the following.

A
CH₃CH₂OH

B
C₆H₅OH

C
CH₃CHOHCH₂CH₃

D
CH₃CH₂CH₂CH₂OH
Question 14
4 / -1

IUPAC name of m-cresol is ___________.

A
3-methylphenol

B
3-chlorophenol

C
3-methoxyphenol

D
benzene-1,3-diol

Solution

The correct answer is Option A.

Its IUPAC name is 3-methyl phenol.
Question 15
4 / -1

Comprehension Type
Direction (Q. Nos. 15-17) This section contains a paragraph, describing theory, experiments, data, etc. Three questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).
Passage
Glycol when heated with concentrated H₂SO₄, undergo a variety of reactions as

Nature of predominant product depends upon the nature of other groups present at the two α-carbons.
Q.
Which is most likely to undergo intermolecular dehydration to give dioxane or substituted dioxane?

A

B

C

D

Solution

Vicinal diols which is not tertiary, prefer to form dioxane while tertiary diols prefer to undergo Pinacol-pinacolone rearrangement.
The diol is not tertiary, hence more likely to form dioxane.
Question 16
4 / -1

Glycol when heated with concentrated H₂SO₄, undergo a variety of reactions as

Nature of predominant product depends upon the nature of other groups present at the two α-carbons.
Q.
Which of the following is most likely to undergo Pinacol-pinacolone rearrangement?

A

B

C

D

Solution

Vicinal diols which is not tertiary, prefer to form dioxane while tertiary diols prefer to undergo Pinacol-pinacolone rearrangement.
It is tertiary diol, undergo Pinacol-pinacolone rearrangeme.
Question 17
4 / -1

Glycol when heated with concentrated H₂SO₄, undergo a variety of reactions as

Nature of predominant product depends upon the nature of other groups present at the two α-carbons.
Q.
Which diol given below is most likely to form diene in the above reaction?

A

B

C

D

Solution

Vicinal diols which is not tertiary, prefer to form dioxane while tertiary diols prefer to undergo Pinacol-pinacolone rearrangement.
Question 18
4 / -1

Matching List Type
Direction (Q . Nos. 18 and 19) C hoices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.
Q.
Match the reactant from Column I with the reaction(s) from Column II and mark the correct option from the codes given below.

A
a

B
b

C
c

D
d

Solution
Question 19
4 / -1

Match the compounds in Column I with their reaction and product(s) in Column II and mark the correct option from the codes given below.

A
a

B
b

C
c

D
d

Solution

(i) It is a symmetrical, 3° diol, gives (CH₃)₂CO with HIO₄, a single pinacolone (CH₃)₃C —COCH₃ and a single cyclic a mine :

(ii) With HIO₄ gives (CH₃)2CO and (C₆H₅)₂CO. (ii) is unsymmetrical, 3° diol, gives more than one pinacolone in rearrangement reaction. However it gives a single cyclic amine.

(iii) with HIO₄ gives a single ketone-acetophenone. It gives two different pinacolone in rearrangement reaction.

(iv) It is unsymmetrical, 3° diol, gives two different ketones with HIO₄ and more than one pinacolone in rearrangement reaction.