NEET and AIPMT NEET Chemistry Alcohols,Phenols and Ethers MCQ Questions Solved


Which of the following will not form a yellow precipitate on heating with an alkaline solution of iodine?

(a) CH3CH(OH)CH3                                  (b) CH3CH2CH(OH)CH3

(c) CH3OH                                               (d) CH3CH2OH

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

(c) An organic compound form yellow precipitate of iodoform with I2 in presence of alkali, if it has

CH3CO- group directly or it             HCH3-C||-            OHhas group.

(a) CH3CH(OH)CH3 + I2 NaOH CH3COCH3 + 2HI + 3NaI  + CH3COONa + 3H2O

     CH3COCH3 + 3I2 + 4NaOH  CHI3 + 3NaI + CH3COONa + 3H2O

                                                 yellow ppt.

(b) CH2-CH2CH(OH)CH3 + I2    + 2HI

It gives iodoform test

(c) CH2OH + I2 HCHO + 2HI

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

(d) CH3CH2OH + I2  CH3-C||-H            O + 2HI

It gives iodoform test

presence of -COCH3, it gives Haloform reaction.

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

(a) PCl5

(b) reduction

(c) oxidation with potassium dichromate

(d) ozonolysis

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

(c) n-propyl alcohol and iso-propyl alcohol gives different products on oxidation with K2Cr2O7

CH3-CH2-CH2OHK2Cr2O7/H2SO4OCH3-CH2-CHO

  n-propyl alcohol                             Propionaldehyde

       1°alcohol

K2Cr2O7/H2SO4O

    Iso-propyl alcohol                       Acetone

         2°alcohol

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Among the following sets of reactants which one produces anisole?                           

(a) CH3CHO, RMgX

(b) C6H5OH, NaOH, CH3I

(c) C6H5OH, neutral FeCl3

(d) C6H5-CH3, CH3COCl, AlCl3

Concept Videos :-

#13 | Reactions & Properties of Ethers: I
#14 | Reactions & Properties of Ethers: II

Concept Questions :-

Ethers: Preparation, Physical & Chemical Properties, Uses

(b) Williamson's synthesis

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Consider the following reaction,

EthanolPBr3Al.KOH Y (ii) H2O, heat(i) H2SO4, room temperatureZ                                

The product Z is

(a) CH2=CH2

(b) CH3CH2OCH2CH3

(c) CH3CH2OSO3H

(d) CH3CH2OH

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

(d)

 

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In the following sequence of reactions,

CH3-BrKCNAH3O+BetherLiAlH4C

the end product C is 

(a) acetone                    (b) methane

(c) acetaldehyde            (d) ethyl alcohol

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

(d) CH3Br -KBrKCNMethyl bromide CH3CNH3O+ Ethane nitrite     A CH3COOHEtherLiAlH4 Ethanoic  acid    B CH3CH2OHEthanol    C

In the presence of LiAlH4 carboxylic acid reduce in alcohols, directly.

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

(a) Phenetole

(b) Ethyl phenyl alcohol

(c) Phenol

(d) None of the above

Concept Videos :-

#13 | Reactions & Properties of Ethers: I
#14 | Reactions & Properties of Ethers: II

Concept Questions :-

Ethers: Preparation, Physical & Chemical Properties, Uses

(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.

 

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Identity Z in the sequence of reactions,                                         

CH3CH2CH=CH2 HBr/H2O2YC2H5ONaZ

(a) CH3-(CH2)3-O-CH2CH3

(b) (CH3)2CH2-O-CH2CH3

(c) CH3(CH2)4-O-CH3

(d) CH3CH2-CH(CH3)-O-CH2CH3

Concept Videos :-

#13 | Reactions & Properties of Ethers: I
#14 | Reactions & Properties of Ethers: II

Concept Questions :-

Ethers: Preparation, Physical & Chemical Properties, Uses

(a) CH3CH2CH=CH2Anti-Markownikoff's ruleHBr/H2O2

      CH3CH2CH2CH2BrBromo-butane (1°  product)

      CH3CH2CH2CH2BrSN2 reactionC2H5ONaCH3CH2CH2CH2OC2H5  (williamson's synthesis)

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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

 

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

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

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Ethylene oxide when treated with Grignard reagent yields                                              

(a) secondary alcohol                                 (b) tertiary alcohol

(c) cyclopropyl alcohol                                (d) primary alcohol

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

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

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In a reaction, 

CH2=CH2acidHypochlorousMR

M=molecules, R=reagent. M and R are 

(a) CH3CH2Cl and NaOH

(b) CH2Cl. CH2OH and aq. NaHCO3

(c) CH3CH2OH and HCl

(d)  and heat

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

(b) CH2=CH2HOClNaHCO3(aq)R

So,M is and R is NaHCO3.

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