CBSE Questions for Class 12 Medical Chemistry Alcohols, Phenols And Ethers Quiz 9 - MCQExams.com

But-$$2$$-ene, $$1, 4$$-diol is converted in two steps through an intermediate X into oxobutanedioic acid.
$$\underset{but-2-ene-1, 4-diol}{HOCH_2CH=CHCH_2OH}\overset{step 1}{\rightarrow} x\underset{hot, acidified KMnO_4}{\overset{step 2}{\rightarrow}}\underset{oxobutanedioic acid}{HO_2CCOCH_2CO_2H}$$
What could be the reagent for step $$1$$ and what is the intermediate X?

reagent for step $$1$$X
Acold, acidified $$KMnO_4$$$$HOCH_2CH_2CH(OH)CH_3OH$$
Bhot, acidified $$K_2Cr_2O_7$$$$HO_2CCH=CHCO_2H$$
Csteam and concentrated $$H_2SO_4$$$$HOCH_2CH(OH)CH_2CH_2OH$$
Dwarm, acidified $$K_2Cr_2O_7$$$$OHCCH(OH)CH_2CHO$$
  • A
  • B
  • C
  • D
Menthol is a naturally occurring alcohol. When menthol is heated with concentrated sulfuric acid it reacts, and the products formed is:

1641862_0b2cf07134f8429aa45d284584ebedf6.png
What is the major product formed when compound $$Q$$ is warmed with excess $$HBr$$?
1649118_055f3cdde26d438fa0d85ce10f92f973.jpg
Which reagent is suitable for this conversion?
1630566_7ec4cb53ecb449e797f59ff81076ca0d.PNG
  • $$Zn-Hg/HCl$$
  • $$LiAlH_4$$
  • $$NH_2-NH_2/OH^-$$
  • Red $$P+HI$$
Ether which is liquid at room temperature is:
  • $$C_2H_5 - O - CH_3$$
  • $$CH_3 - O - CH_3$$
  • $$C_2H_5 - O - C_2H_5$$
  • None of these
Heating together sodium ethoxide and ethyl chloride will give: 
  • ether
  • ethyl alcohol
  • acetaldehyde
  • acetic acid
The reaction, $$(CH_{3})_{3}C - OH \underset {Heat}{\xrightarrow {H_{2}SO_{4}}} (CH_{3})_{2}C = CH_{2}$$, is an example of
  • Sulphonation
  • Decomposition
  • Dehydration
  • Alkylation
An olefin may be converted into alcohol by:
  • $$B_{2}H_{6}$$ and $$H_{2}O_{2}$$
  • $$LiAlH_{4}$$
  • $$Acidic \ KMnO_{4}$$
  • $$HOCl$$
Which of the following will not give anisole?
  • Phenol is reacted with dimethyl sulphate in presence of a base
  • Sodium phenoxide is treated with methyl iodide
  • Diazomethane is reacted with phenol
  • Methyl magnesium iodide is treated with phenol
An equimolar quantities of ethanol and propanol are heated with conc. $$H_2SO_4$$. The products formed is/are: 
  • $$C_2H_5OC_2H_5$$
  • $$C_3H_7OC_3H_7$$
  • $$C_2H_5OC_3H_7$$
  • all of these
The compound(s) which will give propylene on dehydration with $$conc.H_{2}SO_{4}$$ at $$440\ K$$ is/ are
  • Isobytyl alcohol
  • $$n-propyl$$ alcohol
  • Isopropyl alcohol
  • $$n-butyl$$ alcohol
Anisole on treatment with $$Br_2/CS_2$$ gives:
  • bromobenzene
  • methyl-2-bromophenyl ether
  • O- and p-bromoanisole
  • phenol
State whether the following statement is True or False.
Ethylene can be used for the synthesis of ethyl alcohol.
  • True
  • False
Methyl phenyl ether can be obtained by reacting:
  • phenolate ions and methyl iodide
  • methoxide ion and bromobenzene
  • methanol and phenol
  • bromobenzene and methyl bromide
State, whether the following statements are True or False:
Phenol evolves carbon dioxide from sodium bicarbonate.
  • True
  • False
State, whether the following statements are True or False:
Ethers are not affected by atmosphere. 
  • True
  • False
State, whether the following statements are True or False:
Phenol forms $$2,4,6-Tribromophenol$$ with bromine water but form only monobromophenol with $$Br_{2}/CS_{2}$$.
  • True
  • False
img, on reaction with $$CH_3OH$$ in presence of $$H^+$$ gives :
1722365_c4100cbf705545dcb92f12264ef71499.JPG
$$CO+H_2\overset{X(catalyst)}{\underset{300^oC/300 atm}{\rightarrow}}CH_3OH$$, the catalyst X is?
  • $$Fe$$
  • $$Cr_2O_3/ZnO$$
  • $$V_2O_5$$
  • $$Al_2O_3$$
Phenol on standing in air develops a red colour due to formation of:
  • Cyclohexane
  • Resorcinol
  • Phenoquinone
  • Quinol
Wood spirit if known as?
  • Ethanol
  • Methanol
  • Acetone
  • Benzene
Phenol is
  • A base weaker than ammonia
  • An acid stronger than carbonic acid
  • An acid weaker than carbonic acid
  • A neutral compounds
Reaction, $$\underset{Water gas}{\underbrace{CO+H_2}}+H_2\overset{673K, 300 atm.}{\underset{Cr_2O_3-ZnO}{\rightarrow}}?$$ may be used for manufacture of:
  • $$HCHO$$
  • $$CH_3COOH$$
  • $$HCOOH$$
  • $$CH_3OH$$
The only alcohol that can be prepared by the indirect hydration of alkene is:
  • Methyl alcohol
  • Ethyl alcohol
  • Propyl alcohol
  • Isobutyl alcohol
Acid catalysed hydration of alkenes except ethene leads to the formation of.
  • Primary alcohol
  • Secondary or tertiary alcohol
  • Mixture of primary and secondary alcohols
  • Mixture of secondary and tertiary alcohols
Among the following compounds which can be dehydrated very easily?
  • $$CH_3CH_2CH_2CH_2CH_2OH$$
Phenol on treatment with $$dil. HNO_{3}$$ gives:
  • Picric acid
  • $$o-$$ and $$p-nitrophenols$$
  • $$o-$$ and $$m-nitrophenols$$
  • $$p-$$ and $$m-nitrophenols$$
When phenol reacts with benzene diazonium chloride, the product obtained is:
  • Phenylhydrazine
  • p-amino azobenzene
  • Phenol hydroxylamine
  • p-hydroxy azobenzene
During dehydration of alcohols to alkenes by heating with conc. $$H_2SO_4$$, the initiation step is:
  • Elimination of water
  • Formation of an ester
  • Formation of carbocation
  • Protonation of alcohol molecule
Which of the following is soluble in water?
  • $$CS_2$$
  • $$C_2H_5OH$$
  • $$CCl_4$$
  • $$CHCl_3$$
The compound which gives the most stable carbonium ion on dehydration is?
  • $$(CH_3)_2CH-CH_2OH$$
  • $$CH_3CH_2CH_2OH$$
  • $$CH_3-CH(OH)-CH_2CH_3$$
  • $$(CH_3)_3C-OH$$
Isopropyl benzene on air oxidation in the presence of dilute acid gives
  • $$C_{6}H_{5}COOH$$
  • $$C_{6}H_{5}COCH_{3}$$
  • $$C_{6}H_{5}CHO$$
  • $$C_{6}H_{5}OH$$
Mark the correct statement:
  • Water gas is used in the manufacture of methyl alcohol.
  • Water gas has the highest calorific value.
  • Water gas burns with luminuous flame.
  • The production of water gas is exothermic process
The alcohols which gives the most stable carbonium ion on dehydration is?
  • $$(CH_3)_2CHCH_2OH$$
  • $$(CH_3)_3C-OH$$
  • $$CH_3CH_2CH_2CH_2OH$$
Which of the following alcohols will dehydrate most rapidly when treated with conc. $$H_2SO_4$$?
  • $$CH_3-CH_2-CH_2-CH_2-OH$$
Phenol is more acidic than alcohol because:
  • Phenol is more soluble in polar solvents
  • Alcohol does not lose hydrogen atom
  • Phenoxide ion is stabilised by resonance
  • Phenoxide ion does not exhibit resonance
Butane-2-ol is:
  • Primary alcohol
  • Secondary alcohol
  • Tertiary alcohol
  • Aldehyde
What is obtained when chlorine is passed in boiling toluene and product is hydrolysed 
  • o-Cresol
  • p-Cresol
  • 2, 4-Dihydroxytoluene
  • Benzyl alcohol
During dehydration of alcohols to alkenes by heating with conc. $$ H_2SO_4 $$ the initiation step is
  • Protonation of alcohol molecule
  • Formation of carbocation
  • Elimination of water
  • Formation of an ester
Dehydration of ethanol gives 
  • Acetic acid
  • Ethane
  • Ethylene
  • Acetylene
In the following series of chemical reactions, identify Z $$ C_3H_7OH  \quad \xrightarrow [ 160-180^{ 0 }C ]{ Conc.H_{ 2 }SO_{ 4 } } X\xrightarrow [  ]{  Br_2 }Y\xrightarrow [ Excess\ of ]{ Alc. KOH  }  Z $$
  • $$CH_3 - \underset{NH_2}{\underset{\!\!\!\!|}{CH}} - \underset{NH_2}{\underset{\!\!\!\!|}{CH_2}}$$
  • $$CH_3 - \underset{OH}{\underset{\!\!\!\!|}{CH}} - \underset{\!\!\!\!OH}{\underset{\!\!\!\!\!\!\!|}{CH_2}}$$
  • $$CH_3 - \underset{OH}{\underset{|}{C}} = CH_2$$
  • $$ CH_3C \quad \equiv \quad CH $$
The reaction of $$ C_2H_5OH $$ with $$ H_2SO_4 $$ does not give  
  • Ethylene
  • Diethyl ether
  • Acetylene
  • Ethyl hydrogen sulphate
Wine (alcoholic beverages) contains:
  • $$ CH_3OH $$
  • Glycerol
  • $$ C_2H_5OH $$
  • 2-propanol
Propan-1-ol can be prepared from propene by alcohol 
  • $$ H_2O/H_2SO_4 $$
  • $$ Hg(OAc)_2/H_2 O $$ followed by $$ NaBH_4 $$
  • $$ B_2H_6 $$ followed by $$ H_2O_2 $$
  • $$ CH_3CO_2H/H_2SO_4 $$
In the following sequence of reactions
$$CH_3CH_2CH_2Br \overset{KOH(alc)}{\longrightarrow} (A) \overset{HBr}{\longrightarrow} (B) \overset{KOH (aq.)}{\longrightarrow} (C).$$
The product (C) is
  • Propan - 2 - ol
  • Propan - l - ol
  • Propyne
  • Propene
One of the following that cannot undergo dehydro - halogenation is
  • Iso - propyl bromide
  • Ethanol
  • Ethyl bromide
  • None of these
Primary alcohols on dehydration give 
  • Alkenes
  • Alkanes
  • Both (a) and (b)
  • None of these
Which of the following is most soluble in water?
  • n-butyl alcohol
  • Isobutyl alcohol
  • Tertiary butyl alcohol
  • Secondary butyl alcohol
Which of the following is not characteristic of alcohols 
  • They are lighter than water
  • Their boiling points rise fairly uniformly with increasing molecular weight
  • Lower members are insoluble in water and organic solvents but solubility regularly increases with molecular weight
  • Lower members have pleasant smell and burning taste, while higher members are odourless and tasteless
Which of the following is most acidic
  • Phenol
  • Benzyl alcohol
  • m-chlorophenol
  • Cyclohexanol
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