CBSE Questions for Class 12 Engineering Chemistry Alcohols,Phenols And Ethers Quiz 7 - MCQExams.com

The number of carbon atoms present in a molecule of simple ether is:
  • always even
  • always odd
  • either even or odd
  • unpredictable
Which of the following is most reactive towards the acid-catalysed dehyydration?
 
1104919_5b4e9374be2b49d1a3f28f6f7cc9557b.png
Ethers can be prepared by?
  • dehydration of acids
  • hydrolysis of alkyl halides
  • dehydrogenation of alcohols
  • dehydration of alcohols
The formation of oxanium salt of ether is due to:
  • protonation of O atom in ether
  • donation of an e pair by O atom in ether
  • the attachment of a proton to O atom in ether by co-ordination
  • all the above
$$CH_{2} = CH_{2} + H_{2}SO_{4} \xrightarrow[]{75 - 80^{\circ}C} A \xrightarrow[warm]{H_{2}O} B$$
$$A$$ and $$B$$ in the above reaction are:
  • $$C_{2}H_{5}OH ; C_{2}H_{5}HSO_{4}$$
  • $$(C_{2}H_{5})_{2}SO_{4} ; C_{2}H_{5}OH$$
  • $$C_{2}H_{5}HSO_{4} ; C_{2}H_{5}OH$$
  • $$C_{2}H_{5}OH ; (C_{2}H_{5})_{2}SO_{4}$$
The order of reactivity of the following alcohols towards dehydration is:

1117653_496172b3253f48b8b79da48d114dab43.png
  • $$IV > I > II > III$$
  • $$III > IV > II > I$$
  • $$II > I > III > IV$$
  • $$II > III > I > IV$$
Which of the following is alcohol is least towards the acid-catalysed dehyydration?
In an aqueous solution at $${25}^{o}C$$ has twice as many $${OH}^{-}$$ as pure water its $$pOH$$ will be:
  • $$6.699$$
  • $$7.307$$
  • $$7$$
  • $$6.98$$
$$C-O-C$$ bond in ethers can be cleaved by:
  • $${ H }_{ 2 }{ SO }_{ 4 }$$
  • $${ LiAIH }_{ 4 }$$
  • $$KOH$$
  • $$HI$$
Mixed ether will not be formed in the reaction?
  • $$CH_3OCH_2Cl + C_2H_5MgBr$$
  • $$CH_2N_2 + C_2H_5OH$$
  • $$C_2H_5ONa + CH_3I$$
  • $$C_2H_5OH + H_2SO_4 (140^0C)$$
Alcohol can be dehydrated by:
  • $$(C{ H }_{ 3 }CO{ ) }_{ 2 }O$$
  • $$(C{ H }_{ 3 }{ ) }_{ 2 }S{ O }_{ 4 }$$
  • HI/P
  • Anhy$$ZnC{ l }_{ 2 }/\Delta $$
In the reaction
$$ROH+PBr_{3} \rightarrow RBr$$
The number of moles of alcohol that may be converted into alkyl bromide by one mole of $$PBr_{3}$$ is:
  • $$1$$ mole
  • $$2$$ mole
  • $$3$$ mole
  • none of the above
Which of the following alcohols will react with $${H}^{+}$$ with greatest ease?
The relative lowering of the vapour pressure of an aqueous solution containing a non-volatile solute is 0.The molality of the solution is:
  • 0.70
  • 0.30
  • 0.125
  • 0.07
Hydroboration oxidation of 2-methyl but-1-ene gives _____.
  • $$2-methyl \ butan-1-ol$$
  • $$2-methyl\  butan-2-ol$$
  • $$2-methyl\  butan-1, 2-diol$$
  • $$2-methyl\  butan-1, 3-diol$$
Structure of $$C_3H_7Br$$ should be
1149830_92402cb583c64c7e94dac60cc975ae4b.jpg
  • Both of these
  • None of these
Predict the major products (A) and (B).
1198848_3418d5a2301943c99c535ec09e216e55.png
In the  reaction, the product $$A$$ is:
1198816_74a9333859da4d3eb3571832d27d5a84.png
Which of the following exhibit highest boiling point?
Which of the following is a secondary alcohol ?
  • $${ CH }_{ 3 }OH\quad $$
The product A and B respectively are: 
1274428_983eefc55f894437867d4d821cda13ea.png
  • no formation of A and B
Which compound is formed when a mixture of calcium acetate and calcium formate if heated ?
  • $$H_3C-\overset{O}{\overset{||}{C}}-CH_3$$
  • $$H_3C-\overset{O}{\overset{||}{C}}-O-C-CH_3$$
  • $$HCHO$$
  • $$H_3C-CHO$$
Write the IUPAC name of the following compounds.
1349571_9ea74aeef25c4f5c8870da2df6188beb.PNG
  • 1-methoxy-3-nitrocyclohexane
  • 3-methoxy-1-nitrocyclohexane
  • 1-nitro-3-methoxycyclohexane
  • 3-nitro-1-methoxycyclohexane
In which of the following substances, ethanol is not used?
  • Tonics
  • Cough mixture
  • Candle
  • Alcohol
But-2-ene can be obtained by reacting:
  • 1,2-dibromopropane with zinc
  • Ethyl bromide with sodium
  • Ethylidene bromide with zinc
  • n-butyl alcohol with alcoholic KOH
The IUPAC name of the following compound is :

$$CH_3 - \overset{CH_3\!\!\!\!\!}{\overset{|}{CH}} - \overset{O}{\overset{||}{C}} - CH_2 - CH_2 OH$$
  • $$1$$-hydroxy-$$4$$-methylpentan-$$3$$-one
  • $$2$$-methyl-$$5$$-hydroxypentan-$$3$$-one
  • $$4$$-methyl-$$3$$-oxopentan-$$1$$-ol
  • hexan-$$1$$-ol-$$3$$-one
Which of the following compounds when heated with CO at $$ 150^oC $$ and 500 atm pressure in presence of  $$ BF_3 , $$ forms ethyl propionate ?
  • $$ C_2H_5OH $$
  • $$ CH_3OCH_3 $$
  • $$ C_2H_5OC_2H_5 $$
  • $$ CH_3OC_2H_5 $$
Consider the given reaction
Identify alkene.
1414878_55bc8d21ecaf4df8ac63ea5455b36e27.jpg
  • $$CH_{3} - CH_{2} - CH = CH_{2}$$
  • $$CH_{3} - CH = CH - CH_{3}$$
  • $$(CH_{3})_{2}C = C(CH_{3})_{2}$$
  • $$CH_{3} - CH = \underset {\underset {CH_{3}}{|}}{C} - CH_{3}$$
$$A + CCl_4 + KOH \rightarrow$$ Salicylic acid 
'A' in above reaction is
Ethene on reaction with cold & dilute alkaline $$KMnO_4$$ gives ?
  • Ethylene glycol
  • Propylene glycol
  • Acetone
  • Alcohol
Identify the correct order of boiling points of the following  compounds:
$$CH_3CH_2CH_2CH_2OH$$   (1)

$$CH_3CH_2CH_2CHO  $$    (2)

$$CH_3CH_2CH_2COOH $$    (3)
  • 1>2>3
  • 3>1>2
  • 1>3>2
  • 3>2>1
Which of the following combinations can be used for the preparation of cis vic diol?
  • Alkene, Baeyer reagent
  • Alkene ,$$OsO_{4}$$
  • Alkene, MMPP and $$H_{2}O/H$$
  • Both of (A) and (B)
Give the IUPAC name of the above compound.
1469039_b72d6f5e76914d8da2ae5853bc65ddee.PNG
  • 2-Bromo 3-methyl butyric acid
  • 2-Bromo 4-formyl butane
  • 3-Bromo 2-methyl butanoic acid
  • None of the above
The compounds A and B are mixed in equimolar proportion to from the product, $$A+B \rightleftharpoons C +D$$. AT equilibrium, one third of A and B are consumed.The equilibrium constant for the reaction is _______.
  • 0.5
  • 4.0
  • 2.5
  • 0.25
The compounds A and B in the  following reaction are ________ respectively. 
1501834_03ac626334bd4b0880a02119bc5cb461.PNG
  • A = Benzyl alcohol, B = Benzyl cyaninde
  • A = Benzyl chloride, B = benzyl cyanide
  • A = benzyl alcohol, B = Benzyl isocyanide
  • none of these
$$3-methyl-1-butene$$ on oxymercuration -demercuration yields________ as the major product 
  • $$3-methyl-2-butanol$$
  • $$2-methyl-2-butanol$$
  • $$3-methyl-1-butanol$$
  • $$2-methyl-1-buranol$$
Which of the following name does not fit a real name?
  • $$3$$ -methyl $$3$$ -hexanone
  • $$4$$ -methyl $$3$$ -hexanone
  • $$3$$ -methyl $$3$$ -hexanol
  • $$2$$ -methylcyclohexanone
IUPAC name of compound is:
1443013_97b083ceb7eb460d9a154f8b643e4c00.png
  • 5-ethyl-3,3-dimethyl cyclohex-en-6-ol
  • 6-Ethyl-4,4-dimethyl cyclohex-2-en-1-ol
  • 2-ethyl-4,4-dimethyl cyclohex-en--enol
  • 6-ethyl-4,4-dimethyl cyclohexenol
Arrange above structures in increasing order of acidic strength.
1560335_1484b650dea347c685a9eaeb53c3421e.PNG
  • $$I<II<III$$
  • $$I<III<II$$
  • $$II<I<III$$
  • $$II<III<I$$
Correct order of acidic strength.
1630428_234ffe5806b44c768267a246624c02e4.jpg
  • $$I > II > III$$
  • $$II > III > I$$
  • $$I > III > II$$
  • $$III > II > I$$
Three chemical reactions are shown.
1 catalytic addition of steam to ethene
2 combustion of ethanol
3 fermentation of glucose
In which of the reactions does the relative molecular mass of the carbon-containing compound
decrease?
  • $$1$$ and $$2$$
  • $$1$$ only
  • $$2$$ and $$3$$
  • $$3$$ only
Which of the following alcohol has the highest boiling point?
  • $$Butan-2-ol$$
  • $$2-Methylpropan-2-ol$$
  • $$Propan-2-ol$$
  • $$Butan-1-ol$$
Find the product:
1561905_5034c8d880d546bc98d823199ac03255.PNG
Menthol is a naturally occurring alcohol. When menthol is heated with concentrated sulfuric acid it reacts, and the products formed is:

1641862_0b2cf07134f8429aa45d284584ebedf6.png
Which of the following ether is unlikely to be cleaved by hot  cone.  HBr.
Which reagent is suitable for this conversion?
1630566_7ec4cb53ecb449e797f59ff81076ca0d.PNG
  • $$Zn-Hg/HCl$$
  • $$LiAlH_4$$
  • $$NH_2-NH_2/OH^-$$
  • Red $$P+HI$$
 
1630573_1c4cf39d41484688bc933caa2a9a76e3.png
Find the product :
1564611_6a41bbcdb3d34baba3404ef20b6addbc.png
When the reaction between methyl iodide and sodium ethoxide occurs, we get:
  • methyl acetate
  • ethyl methyl ketone
  • ethyl acetate
  • ethyl methyl ether
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