CBSE Questions for Class 12 Engineering Chemistry Alcohols,Phenols And Ethers Quiz 3 - MCQExams.com

 In the following dehydration of diol with $$\displaystyle { H }_{ 3 }{ PO }_{ 4 }$$, following product is:
263286_a06dbf82c7064773965c3fb806203ba0.png
Lower alcohols are more soluble in water than higher alcohols.
  • True
  • False
Consider the reaction between $$\displaystyle C_{2}H_{5}O^{\circleddash }$$ and dimethyl sulphate. The leaving group in this reaction is
  • $$\displaystyle MeOSO_{2}O^{\circleddash }$$
  • $$\displaystyle MeO^{\circleddash }$$
  • $$\displaystyle Me^{\circleddash }$$
  • $$\displaystyle MeOSO_{2}^{\circleddash }$$
The correct reactivity order of alcohols towards $$H-X$$ will be:


262804.bmp
  • $$\;II>I>III>IV$$
  • $$\;IV>III>II>I$$
  • $$\;II>IV>I>III$$
  • $$\;II>IV>III>I$$
 Phenol on reaction with $$\displaystyle { NH }_{ 3 }$$ gives :-
  • Aniline
  • Nitrobenzene
  • Benzaldehyde
  • Anilinium chloride
Which of the following is a primary alcohol ?
  • Butan - 2 - ol
  • 2 - Methylpropan -1- ol
  • 2 - Methylpropan - 2- ol
  • None of the above
The major product of the above reaction is:
295223_6d0aa3256f914da38e4251a6e014d1a1.PNG
Carbinol is a trivial name of :-
  • $$\displaystyle { C }_{ 2 }{ H }_{ 5 }OH$$
  • $$\displaystyle { CH }_{ 3 }OH$$
  • $$\displaystyle HCOOH$$
  • $$\displaystyle { CH }_{ 3 }COOH$$
The high boiling point of ethanol $$(78.2^o C)$$ compared to dimethyl ether $$(-23.6^o C)$$, though both having the same molecular formula $$\displaystyle { C }_{ 2 }{ H }_{ 6 }O$$, is due to:
  • hydrogen bonding
  • ionic bonding
  • co-ordinate covalent bonding
  • resonance
Heating together of sodium ethoxide and ethyl iodide will give:
  • ether
  • ethyl alcohol
  • acetaldehyde
  • acetic acid
For phenol, which of the following statements is correct?
  • It is insoluble in water
  • It has higher boiling point than toluene
  • It does not shows acidic property
  • It has lower melting point compared to aromatic hydrocarbons of comparable molecular weight
Mark the correct order of decreasing acid strength of the following compounds.
284180_65592894396a4fa1add940701c17d6c3.PNG
  • e > d > b > a > c
  • b > d > a > c > e
  • d > e > c > b > a
  • e > d > c > b > a
A vicinal diol has two alcoholic groups present :
  • on the same carbon
  • on adjacent carbon atoms
  • anywhere along the carbon chain
  • none of the above
Electrophilic substitution reaction in phenol takes place at:
  • para position
  • meta position
  • ortho position
  • ortho and para position
The IUPAC name of $$CH_3\, -\, C(CH_3) (OH) CH_2\, -\, CH(CH_3)\, CH_3$$ is :
  • 2, 4 - Dimethylpentan - 2 - ol
  • 2, 4 - Dimethylpentan - 4 - ol
  • 2, 2 - Dimethylbutane
  • Isopentanol
The major product obtained on acid - catalysed hydration of 2-phenylpropene is:
  • 2-phenylpropan-2-ol
  • 2-phenylpropan-1-01
  • 3-phenylpropan-2-ol
  • 1-phenylpropan-1-ol
Among ethanol, dimethyl ether, methanol and propanal, the isomers are
  • ethanol, dimethyl ether, methanol and propanal
  • ethanol and methanol
  • ethanol, dimethyl ether, and methanol
  • ethanol and dimethyl ether
What are the types of reactions occurring in the formation of X, Y and Z respectively?
316121_58d4ceeb1e10416d9ab171a037052c1c.png
  • Oxidation, Reduction, Substitution
  • Substitution, Esterification, Dehydration
  • Reduction, Substitution, Oxidation
  • Dehydration, Oxidation, Esterification
Refer the given reactions and answer the following questions:
Identify X, Y and Z respectively:

316120_20c56845e3e745a8941c4b3322ad3dd2.png
  • $$\displaystyle CH_{3}COOH,CH_{2}= CH_{2},CH_{3}COOCH_{3}$$
  • $$\displaystyle CH_{2}= CH_{2},CH_{3}COOH,CH_{3}COOCH_{2}CH_{3}$$
  • $$\displaystyle HCHO,CH_{3}CH_{3},CH_{3}CH_{2}COOH $$
  • $$\displaystyle CH_{3}CH_{3},HCHO,CH_{3}COOH $$
Methanol is now prepared from:
  • water gas
  • sugar through fermentation
  • wood
  • both $$A$$ and $$B$$
Identify the stereoisomeric pair from the following choices
  • $$CH_3 CH_2 CH_2 OH$$ and $$CH_3 CH_2 OCH_3$$
  • $$CH_3 CH_2 CH_2 Cl$$ and $$CH_3 CHClCH_3$$
What is the common name of methyl alcohol?
  • Wine
  • Wood spirit
  • Dilute acid
  • None of the above
Among the four compounds (i) acetone, (ii) propanol, (iiii) methyl acetate and (iv) propionic acid, the two that are isomeric are
  • methyl acetate and acetone
  • methyl acetate and propanol
  • propionic acid and methyl acetate
  • propionic acid and acetone
How many structures of F is possible?
305370_3f682dc302e64e30ba6d2099e2066d93.png
  • 2
  • 5
  • 6
  • 3
The product formed by decolourization of $$KMn{O}_{4}$$ by ethylene is _________ which is used as ______.
  • ethane, oxidant
  • ethyl alcohol, coolant
  • ethylene glycol, antifreeze
  • ethanol, reductant
Which among the following reactions does not give methyl alcohol?
  • The reaction of ethylene with $${H}_{2}{SO}_{4}$$ at $${80}^{o}C$$
  • The reaction of water gas with hydrogen at high temperature
  • Alkaline hydrolysis of methyl bromide
  • Both $$A$$ and $$B$$
The molecular formula of ethanol is :
  • $$(CH_3)_2 CHOH$$
  • $$C_2 H_5 OH$$
  • $$CH_3 OH$$
  • $$CH_3 CH_2 CH_2 OH$$
Glycol is a:
  • primary alcohol
  • dihydric alcohol
  • secondary alcohol
  • trihydric alcohol
Identify the major product X obtained in the following reaction.

$$2, 3-\text{dimethyl butan}-2-ol\xrightarrow []{Conc.H_{ 2 }SO_{ 4 }} X$$
In the following reation,
$$\underset{(in\ excess)}{Ethyl \ alcohol}+\underset{(from\ H_2SO_4)}{H^+}\overset{413K}{\rightarrow}$$ product, the product is:
  • ethene
  • ethyl hydrogen sulphate
  • diethyl ether
  • acetylene
The suffix used in the nomenclature of alcohol is:
  • 'al'
  • 'ol'
  • 'yl'
  • 'one'
Propene on hydration gives
  • propan-1-ol
  • propan-2-ol
  • propanal
  • methoxy ethane
The compound which reacts fastest with Lucas reagent at room temperature, is
  • butan-1-ol
  • butan-2-ol
  • 2-methyl propan-1-ol
  • 2-methyl propan-2-ol
The correct order of boiling point for primary $$\left( { 1 }^{ } \right) $$, secondary $$\left( { 2 }^{ } \right) $$ and tertiary $$\left( { 3 }^{ } \right) $$ alcohols is:
  • $${ 1 }^{ } > { 2 }^{ } > { 3 }^{ }$$
  • $${ 3 }^{ } > { 2 }^{ } > { 1 }^{ }$$
  • $${ 2 }^{ } > { 1 }^{ } > { 3 }^{ }$$
  • $${ 2 }^{ } > { 3 }^{ } > { 1 }^{ }$$
What amount of bromine will be required to convert $$2\ g$$ of phenol into $$2, 4, 6-tribromophenol$$?
  • $$4.00$$
  • $$6.00$$
  • $$10.22$$
  • $$20.44$$
The bond angle of the bond $$C-O-C$$ in methoxy methane is:
  • $$111.7$$
  • $$109$$
  • $$108.9$$
  • $$180$$
Sodium phenoxide $$\xrightarrow [ pressure ]{ { CO }_{ 2 } }  A \xrightarrow [  ]{ { { H }_{ 3 }O }^{ + } } $$ o-hydroxy benzoic acid
This product can also be obtained by the reaction of which of the following?
  • Phenol + chloroform +alkali
  • Phenol + pyrene + alkali
  • Phenol + acetyl chloride + $$Al{Cl}_{3}$$
  • Phenol + methyl chloride + $$Al{Cl}_{3}$$
The miscibility of ether with _______ resembles those of alcohol of the same molecular mass.
  • methanol
  • water
  • DCM
  • benzene
With ethoxyethane which compound is miscible to almost the same extent?
  • Formaldehyde
  • Bhutanone
  • Butan-1-ol
  • Propan-1-ol
Among the following which has the highest boiling point?
  • $$CH_3CH_2OH$$
  • $$CH_3CH_2CH_3$$
  • $$CH_2=CHCH_3$$
  • $$CH_3OCH_3$$
Which of the following alcohols forms a ketone when oxidized?
  • 1-Propanol
  • Methanol
  • 2-Methyl-2-propanol
  • 2-Propanol
In iodine charge transfer test the color of ether compound formed is:
  • blue
  • pale yello
  • brown
  • dark red
Which of the following is the functional group of an ether?
  • $$R - OH$$
  • $$R - O - R$$
  • $$R-CO-R'$$
  • $$R-COOH$$
  • $$RCHO$$
The_____ ethers are highly volatile and flammable.
  • Higher
  • Lower
  • Both A and B
  • None of these
Methanol cannot be prepared by the hydration of an alkene.
  • True
  • False
Ethers show dipolar nature due to the presence of ______.
  • central C atom
  • central O atom
  • central N atom
  • none of these
$$CH_3OH\xrightarrow{P+I_2}A  \xrightarrow{Mg/dry\ ether}B\xrightarrow{HCHO}C\xrightarrow{{H^+/H_2O}}D$$

What are $$B$$ & $$D$$ respectively?
  • $$CH_3MgI$$, $$CH_3CHO$$
  • $$CH_3MgI$$, $$CH_3CH_2OH$$
  • $$CH_3MgI$$, $$CH_3COOH$$
  • $$CH_3MgI$$, $$CH_3COCH_3$$
_____________ is prepared on a large seals from water gas.
  • Methanol
  • Ethanal
  • Methane
  • Ethanol
On treatment with dilute $$H_2SO_4$$, ethene forms ethanol.
  • True
  • False
Metallic sodium reacts with methanol and ethanol to give $$O_2$$ gas.
  • True
  • False
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