NEET Chemistry Alcohols,Phenols and Ethers Questions Solved

#2 | Preparation of Alcohols: II

#3 | Preparation of Alcohols: III

#4 | Properties of Alcohols & Phenols (Comparative)

#5 | Chemical Properties of Alcohols

#7 | Preparation & Properties of Dihydric Alcohols

#8 | Reactions of Dihydric Alcohol

#9 | Preparation & Properties of Trihydric Alcohols

Concept Questions :-

Alcohols: Preparation, Physical and Chemical Properties

elem

CH₃CO- group directly or it $H {CH}_{3} - C_{|}^{|} - OH$ has group.

(a) CH₃CH(OH)CH₃ + I₂ $\overset{NaOH}{\to}$ CH₃COCH₃ + 2HI + 3NaI + CH₃COONa + 3H₂O

CH₃COCH₃ + 3I₂ + 4NaOH $\to$ CHI₃ $↓$ + 3NaI + CH₃COONa + 3H₂O

yellow ppt.

(b) CH₂-CH₂CH(OH)CH₃ + I₂ $\to$ + 2HI

It gives iodoform test

It does not have methyl ketone group, so it does not give yellow ppt with I₂ in presence of alkali.

(d) CH₃CH₂OH + I₂ $\to$ ${CH}_{3} - \underset{| |}{C} - H O$ + 2HI

It gives iodoform test

presence of -COCH₃, it gives Haloform reaction.

Difficulty Level:

(a)
9%
(b)
14%
(c)
65%
(d)
14%

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n-propyl alcohol and iso-propyl alcohol can be chemically distinguished by which reagent

(a) ${PCl}_{5}$

(b) reduction

(d) ozonolysis

Q2:

Concept Videos :-

#1 | Preparation of Alcohols

#2 | Preparation of Alcohols: II

#3 | Preparation of Alcohols: III

#4 | Properties of Alcohols & Phenols (Comparative)

#5 | Chemical Properties of Alcohols

#7 | Preparation & Properties of Dihydric Alcohols

#8 | Reactions of Dihydric Alcohol

#9 | Preparation & Properties of Trihydric Alcohols

Concept Questions :-

Alcohols: Preparation, Physical and Chemical Properties

elem

${CH}_{3} - {CH}_{2} - {CH}_{2} OH \to_{K_{2} {Cr}_{2} O_{7} / H_{2} {SO}_{4}}^{[O]}$ ${CH}_{3} - {CH}_{2} - CHO$

n-propyl alcohol Propionaldehyde

$1^{°}$ alcohol

$\to_{K_{2} {Cr}_{2} O_{7} / H_{2} {SO}_{4}}^{[O]}$

Iso-propyl alcohol Acetone

$2^{°}$ alcohol

Difficulty Level:

(a)
19%
(b)
18%
(c)
55%
(d)
10%

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Among the following sets of reactants which one produces anisole?

(a) CH₃CHO, RMgX

(b) C₆H₅OH, NaOH, CH₃I

(d) C₆H₅-CH₃, CH₃COCl, AlCl₃

Q3:

Concept Videos :-

#13 | Reactions & Properties of Ethers: I

#14 | Reactions & Properties of Ethers: II

Concept Questions :-

Ethers: Preparation, Physical & Chemical Properties, Uses

elem

(b) Williamson's synthesis

Difficulty Level:

(a)
13%
(b)
55%
(c)
13%
(d)
22%

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Consider the following reaction,

Ethanol $\overset{{PBr}_{3}}{\to}$ X $\overset{Al . KOH}{\to}$ Y $\to_{(ii) H_{2} O, heat}^{(i) H_{2} {SO}_{4}, room temperature}$ Z

The product Z is

(a) CH₂=CH₂

(b) CH₃CH₂OCH₂CH₃

(d) CH₃CH₂OH

Q4:

Concept Videos :-

#1 | Preparation of Alcohols

#2 | Preparation of Alcohols: II

#3 | Preparation of Alcohols: III

#4 | Properties of Alcohols & Phenols (Comparative)

#5 | Chemical Properties of Alcohols

#7 | Preparation & Properties of Dihydric Alcohols

#8 | Reactions of Dihydric Alcohol

#9 | Preparation & Properties of Trihydric Alcohols

Concept Questions :-

Alcohols: Preparation, Physical and Chemical Properties

elem

(d)

Difficulty Level:

(a)
19%
(b)
16%
(c)
18%
(d)
48%

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In the following sequence of reactions,

${CH}_{3} - Br \overset{KCN}{\to}$ A $\overset{H_{3} O^{+}}{\to}$ B $\to_{ether}^{{LiAlH}_{4}}$ C

the end product C is

(a) acetone (b) methane

Q5:

Concept Videos :-

#1 | Preparation of Alcohols

#2 | Preparation of Alcohols: II

#3 | Preparation of Alcohols: III

#4 | Properties of Alcohols & Phenols (Comparative)

#5 | Chemical Properties of Alcohols

#7 | Preparation & Properties of Dihydric Alcohols

#8 | Reactions of Dihydric Alcohol

#9 | Preparation & Properties of Trihydric Alcohols

Concept Questions :-

Alcohols: Preparation, Physical and Chemical Properties

elem

(d) ${CH}_{3} Br \to_{- KBr}^{KCN} Methyl bromide$ ${CH}_{3} CN \overset{H_{3} O^{+}}{\to} Ethane nitrite A$ ${CH}_{3} COOH \to_{Ether}^{{LiAlH}_{4}} Ethanoic acid B$ ${CH}_{3} {CH}_{2} OH Ethanol C$

In the presence of ${LiAlH}_{4}$ carboxylic acid reduce in alcohols, directly.

Difficulty Level:

(a)
8%
(b)
12%
(c)
25%
(d)
57%

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Which one is formed when sodium phenoxide is heated with ethyl iodide?

(a) Phenetole

(b) Ethyl phenyl alcohol

(d) None of the above

Q6:

Concept Videos :-

#13 | Reactions & Properties of Ethers: I

#14 | Reactions & Properties of Ethers: II

Concept Questions :-

Ethers: Preparation, Physical & Chemical Properties, Uses

elem

(a) When sodium phenoxide (C₆H₅ONa) is heated with ethyl iodide (C₂H₅I) it forms ethyl phenyl ether which is also called phenetole. This reaction is called Williamson's synthesis.

Difficulty Level:

(a)
39%
(b)
29%
(c)
20%
(d)
14%

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Identity Z in the sequence of reactions,

CH₃CH₂CH=CH₂ $\overset{HBr / H_{2} O_{2}}{\to}$ Y $\overset{C_{2} H_{5} ONa}{\to}$ Z

(a) CH₃-(CH₂)₃-O-CH₂CH₃

(b) (CH₃)₂CH₂-O-CH₂CH₃

(d) CH₃CH₂-CH(CH₃)-O-CH₂CH₃

Q7:

Concept Videos :-

#13 | Reactions & Properties of Ethers: I

#14 | Reactions & Properties of Ethers: II

Concept Questions :-

Ethers: Preparation, Physical & Chemical Properties, Uses

elem

(a) CH₃CH₂CH=CH₂ $\to_{Anti - Markownikoff' s rule}^{HBr / H_{2} O_{2}}$

CH₃CH₂CH₂CH₂Br $\to$ Bromo-butane (1 $°$ product)

CH₃CH₂CH₂CH₂Br $\to_{SN 2 reaction}^{C_{2} H_{5} ONa}$ CH₃CH₂CH₂CH₂OC₂H₅ (williamson's synthesis)

Difficulty Level:

(a)
59%
(b)
15%
(c)
10%
(d)
18%

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Reaction of ethyl formate with excess of CH₃MgI followed by hydrolysis gives

(1) n-propyl alcohol (2) ethanol (3) isopropyl alcohol (4) propanal

Q8:

Concept Videos :-

#1 | Preparation of Alcohols

#2 | Preparation of Alcohols: II

#3 | Preparation of Alcohols: III

#4 | Properties of Alcohols & Phenols (Comparative)

#5 | Chemical Properties of Alcohols

#7 | Preparation & Properties of Dihydric Alcohols

#8 | Reactions of Dihydric Alcohol

#9 | Preparation & Properties of Trihydric Alcohols

Concept Questions :-

Alcohols: Preparation, Physical and Chemical Properties

elem

(3) Ethyl formate on reaction with excess of CH₃MgI, followed by hydrolysis gives a secondaty alcohol i.e. isopropyl alcohol.

Difficulty Level:

(a)
16%
(b)
21%
(c)
54%
(d)
10%

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Ethylene oxide when treated with Grignard reagent yields

(a) secondary alcohol (b) tertiary alcohol

Q9:

Concept Videos :-

#1 | Preparation of Alcohols

#2 | Preparation of Alcohols: II

#3 | Preparation of Alcohols: III

#4 | Properties of Alcohols & Phenols (Comparative)

#5 | Chemical Properties of Alcohols

#7 | Preparation & Properties of Dihydric Alcohols

#8 | Reactions of Dihydric Alcohol

#9 | Preparation & Properties of Trihydric Alcohols

Concept Questions :-

Alcohols: Preparation, Physical and Chemical Properties

elem

(d) Ethylene oxide on treatment with Grignard reagent give additive product which undergo hydrolysis to give primary alcohol as final product

Difficulty Level:

(a)
25%
(b)
11%
(c)
9%
(d)
56%

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In a reaction,

${CH}_{2} = {CH}_{2} \to_{acid}^{Hypochlorous}$ M $\overset{R}{\to}$

M=molecules, R=reagent. M and R are

(a) ${CH}_{3} {CH}_{2} Cl$ and NaOH

(b) ${CH}_{2} Cl . {CH}_{2} OH$ and aq. ${NaHCO}_{3}$

(d) and heat

Q10:

Concept Videos :-

#1 | Preparation of Alcohols

#2 | Preparation of Alcohols: II

#3 | Preparation of Alcohols: III

#4 | Properties of Alcohols & Phenols (Comparative)

#5 | Chemical Properties of Alcohols

#7 | Preparation & Properties of Dihydric Alcohols

#8 | Reactions of Dihydric Alcohol

#9 | Preparation & Properties of Trihydric Alcohols

Concept Questions :-

Alcohols: Preparation, Physical and Chemical Properties