Alcohols Phenols and Ethers Test

Result

Alcohols Phenols and Ethers Test - 41

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Weekly Quiz Competition

Question 1
1 / -0

The correct decreasing order of dehydration of following alcohols with conc. $$H_2SO_4$$ is:

A
C > A > B > D

B
D > A > C > B

C
A > B > C > D

D
D > C > A > B

Solution

Dehydration order will include D first because after dehydration aromatic compound(stable) is formed . In this way, the order is arranged according to the stability of the compound formed.
Question 2
1 / -0

Methylphenyl ether can be obtained by reacting :

A
phenolate ions and methyl iodide

B
methoxide ions and bromobenzene

C
methanol and phenol

D
bromo benzene and methyl bromide

Solution

This reaction helps in the formation of methyl phenyl ether.
Question 3
1 / -0

Which of the following is best method to prepare phenyl-t-butyl ether?

A
$$(CH_{3})_{3}C - O^{-}Na^{+} + C_{6}H_{5}Br$$

B
$$C_{6}H_{5}ONa + (CH_{3})_{3}CCl$$

C
$$(CH_{3})_{2}C = CH_{2}\xrightarrow[C_6H_5OH]{Hg(OCOCH_3)_{2}} \overset{NaBH_4}{\rightarrow}$$

D
None of these

Solution

This reaction is williamson ether synthesis.
Question 4
1 / -0

Rate of dehydration when given compound is treated with conc, $${ H }_{ 2 }{ SO }_{ 4 }$$.

A
P > Q > R > S

B
Q > P > R > S

C
R > Q > P > S

D
R > Q > S > P
Question 5
1 / -0

Correct representation of 3- methylpent-3-en-2-ol is :

A

B

C

D

Solution
Question 6
1 / -0

The best method to prepare 3-methylbutan-2-ol from 3-methylbut-1-ene is:

A
addition of water in presence of dil. $$H_2SO_4$$

B
addition of $$HCI$$ followed by reaction with dil. $$NaOH$$

C
hydroboration - oxidation reaction

D
Reimer - Tiemann reaction.

Solution

To prepare 3-methylbutan-2-ol from 3-methylbut-1-ene shouls involve Markovnikov's addition of $$H-OH$$ across double bond
A. Addition of water in presence of dil. $$H_2SO_4$$ follows Markovnikov's addition of $$H-OH$$ across the alkene
B. Addition of $$HCI$$ followed by reaction with dil. $$NaOH$$ to an alkene can give substitution and elimination product after alkyl halide formation
C. Hydroboration-oxidation reaction follows Anti-Markovnikov's addition of $$H-OH$$
D.Reimer - Tiemann reaction.is a chemical reaction used for the ortho-formylation of phenols
Thus the best method to prepare 3-methylbutan-2-ol from 3-methylbut-1-ene is the addition of water in presence of dil. $$H_2SO_4$$.
Question 7
1 / -0

Product of the above reaction is:

A

B

C

D

Solution
Question 8
1 / -0

A hydrocarbon $$'A' (C_{3}H_{8})$$ on treatment with chlorine in presence of sunlight yielded compound $$'B'$$ as the major product. Reaction of $$'B'$$ with aqueous $$KOH$$ gave $$'C'$$ which on treatment with concentrated $$H_{2}SO_{4}$$ yielded $$'D'$$. Hydrogenation of $$'D'$$ gave back $$'A'$$. The sequence of reactions involved in the above conversion is:

A
Substitution, Substitution, Addition, Dehydration

B
Substitution, Substitution, Dehydration, Addition

C
Substitution, Dehydration, Addition, Addition

D
Addition, Substitution, Dehydration, Substitution

Solution

(i) $$C_{3}H_{8} + Cl_{2}\xrightarrow {hv} C_{3}H_{7}Cl + HCl [Substitution]$$
(ii) $$C_{3}H_{7}Cl + Aq\ KOH \xrightarrow {hv} C_{3}H_{7}OH + KCl [Substitution]$$
(iii) $$C_{3}H_{7}OH \xrightarrow {dil\ H_{2}SO_{4}} C_{3}H_{6} + H_{2}O [Dehydration]$$
(iv) $$C_{3}H_{6} + H_{2} \rightarrow C_{3}H_{8} [Addition]$$.
Question 9
1 / -0

Ethyl alcohol obtained by fermentation of starch or molasses is called wash, and what is it’s purity?

A
15%

B
45%

C
55%

D
35%

Solution
Question 10
1 / -0

The correct IUPAC name of the compound is ?

A
2-ethyl-1-chlorocyclohexanol

B
4-chloro-5-ethylcyclhexanol

C
4-hydroxy-2-ethyl-1-chlorocycloheane

D
4chloro-3-ethylcyclohexanol

Solution

-OH group is given preference over Cl group so, 1 number to carbon attach to -OH group
so,4-chloro-3 ethyl-cyclohexan -1-ol