Alcohol, Phenol and Ether Test

Result

Alcohol, Phenol and Ether Test - 11

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

A simple method to remove peroxides from ethers is to treat them with an aqueous solution of

A
KI

B
KCNS

C
Na₂S₂O₃

D
Br₂

Solution

KI is added to old stocks of ethers when I^- is oxidized to I₂ by ether peroxide, which itself is reduced to ether.
Question 2
1 / -0

Which of the following is most soluble in water?

A
Phenol

B
p-cresol

C
Hydroquinone

D
Picric acid

Solution

Due to the presence of two –OH groups, hydroquinone undergoes more extensive H-bonding with H₂O.
Question 3
1 / -0

Which of the following compounds decolourises aqueous bromine and gives white fumes of HCl on reaction with PCl₅?

A
CH₃CH₂CH₂CH₂OH

B
CH₃COCH₂CH=CH₂

C
CH₃OCH₂CH₂CH₂OH

D
CH₃CH=CHCH₂CH₂OH

Solution

Since the compound decolourises Br₂, it must contain a double bond. Further, since it gives dense white fumes of HCl with PCl₅, it must contain an –OH group.
Question 4
1 / -0

The most favourable conditions for alcohol fermentation of sugar are

A
high concentration of sugar solution, low temperature and plenty of air

B
low concentration of sugar solution, high temperature and plenty of air

C
low concentration of sugar solution, low temperature and absence of air

D
None of the above

Solution

Low concentration (< 10%) of sugar solution, low temperature (288-305 K) and absence of air