CBSE Questions for Class 12 Medical Chemistry Alcohols, Phenols And Ethers Quiz 8 - MCQExams.com

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 most reactive towards the acid-catalysed dehyydration?
Consider the following reaction :
The product Z is:
1112901_7ece5fa0568041ada83e5618bc291178.png
  • benzene
  • toluene
  • benzaldehyde
  • benzoic acid
Phenol can be distinguished from ethanol by the reaction with :
  • $$Na$$
  • $$Br_{2}/Water$$
  • Neutral $$AlCl_{3}$$
  • $$1$$ and $$2$$
$$CH_{2} = CH_{2} + H_{2}SO_{4} \xrightarrow[]{75 - 80^{\circ}C} A \xrightarrow[warm]{H_{2}O} B$$
$$A$$ and $$B$$ in the above reaction are:
  • $$C_{2}H_{5}OH ; C_{2}H_{5}HSO_{4}$$
  • $$(C_{2}H_{5})_{2}SO_{4} ; C_{2}H_{5}OH$$
  • $$C_{2}H_{5}HSO_{4} ; C_{2}H_{5}OH$$
  • $$C_{2}H_{5}OH ; (C_{2}H_{5})_{2}SO_{4}$$
Phenol reacts with acetone in the presence of conc. Sulphuric acid to form a $${C}_{15}{H}_{16}{O}_{2}$$ product. The structural formula of the product is:
  • $$X\begin{matrix} O-C_6H \\\!\!\!\!\!\!\!OC_6H_5 \end{matrix}$$
Phenol can be distinguished from ethanol by reactions with the following except:
  • Iodine and alkali
  • Ferric chloride
  • Acetyl chloride
  • Bromine water
In the following reaction
$$Phenol \overset{Zn dust}{\rightarrow} X \xrightarrow[anh. Alcl_3]{CH_3Cl} Y \overset{alk.KMnO_4/\triangle}{\rightarrow} Z$$
The product Z is:
  • toulene
  • benzaldehyde
  • benzoic acid
  • benzene
Identify Z in the given sequence of reaction.
1119440_9788efbd6eee4174be6d26f39aa4c683.png
$$C-O-C$$ bond in ethers can be cleaved by:
  • $${ H }_{ 2 }{ SO }_{ 4 }$$
  • $${ LiAIH }_{ 4 }$$
  • $$KOH$$
  • $$HI$$
Mixed ether will not be formed in the reaction?
  • $$CH_3OCH_2Cl + C_2H_5MgBr$$
  • $$CH_2N_2 + C_2H_5OH$$
  • $$C_2H_5ONa + CH_3I$$
  • $$C_2H_5OH + H_2SO_4 (140^0C)$$
In this reaction the product $$X$$ is:
1121261_2c50fc64a27a4a67bad99a7b2d852098.png
  • $$C_6H_5OC_2H_5$$
  • $$C_2H_5OC_2H_5$$
  • $$C_6H_5OC_6H_5$$
  • $$C_6H_5I$$
.
1121959_29fd6b04ff1b408bb85e0fcc370941b1.png
  • $$FeCl_{ 3 }$$
  • $$NaOH$$
  • $$NaNO_{ 2 }$$
  • Fehling's Solution .
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 an aqueous solution at $${25}^{o}C$$ has twice as many $${OH}^{-}$$ as pure water its $$pOH$$ will be:
  • $$6.699$$
  • $$7.307$$
  • $$7$$
  • $$6.98$$
Phenol can be distinguished from ethyl alcohol by reagent except:
  • NaOH
  • $$FeCl_{3}$$
  • $$Br_{2}/H_{2}O$$
  • Na
 Which of the following does not react with sodium hydroxide?
  • Phenol
  • Benzoic acid
  • Acetic acid
  • Benzophenone
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
What is the major product in the following reaction?
1136557_3bd24350c65e4f65b99b5803826b3749.PNG
  • o-bromophenol
  • p-bromophenol
  • 2,4,6-tribromophenol
  • m-bromophenol
Consider the following reaction:
$$ Phenol \xrightarrow [  Zn]{ dust } X \xrightarrow [ CH_3Cl ]{ Anhy. AlCl_3 } Y \xrightarrow [ KMnO_4 ]{ alkaline} Z $$

the product Z is :  
  • Benzaldehyde
  • Benzoic acid
  • Benzene
  • Toluene
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
By which of the following methods alcohol can be prepared in excellent yield ?
  • From alkenes
  • By hydroboration-oxidation
  • From carbonyl compounds
  • From Grignard reagent
Which of the following alcohols will react with $${H}^{+}$$ with greatest ease?
Phenol on heating with$${NaNO}_{2}$$ and a few drops of concentrated sulphuric acid mainly gives:
  • Para nitrophenol
  • Para nitrosophenol
  • Ortho nitrophenol
  • Meta nitrophenol
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
The homologue of phenol is:
The phenol having lowest acidity is
Which of the following is a secondary alcohol ?
  • $${ CH }_{ 3 }OH\quad $$
Benzene can be obtained by heating either benzoic acid with X or  phenol with Y. X and Y respectively are
  • Zinc dust and soda lime
  • Soda lime and zinc dust
  • Zinc dust and sodium hydroxide
  • Soda-lime and copper
Molecule which does not oxidise using PCC?
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 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
Ethene on reaction with cold & dilute alkaline $$KMnO_4$$ gives ?
  • Ethylene glycol
  • Propylene glycol
  • Acetone
  • Alcohol
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
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
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)
Which of the following ether is unlikely to be cleaved by hot  cone.  HBr.
$$3-methyl-1-butene$$ on oxymercuration -demercuration yields________ as the major product 
  • $$3-methyl-2-butanol$$
  • $$2-methyl-2-butanol$$
  • $$3-methyl-1-butanol$$
  • $$2-methyl-1-buranol$$
The compound formed on hydroysis of the adduct of methyl magnesium iodide and benzaldehyde:
  • is a phenol.
  • gives iodoform test.
  • is a primary alcohol.
  • gives benzophenone on oxidation.
Find the product :
1564611_6a41bbcdb3d34baba3404ef20b6addbc.png

1585789_782ef124be364afaa9339202a6386b65.PNG
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
When the reaction between methyl iodide and sodium ethoxide occurs, we get:
  • methyl acetate
  • ethyl methyl ketone
  • ethyl acetate
  • ethyl methyl ether
Ethene reacts with $$Y$$ to produce ethanol.
$$ethene + Y \rightarrow ethanol$$
What is $$Y$$?
  • Hydrogen
  • Oxygen
  • Steam
  • Yeast
Correct order of acidic strength.
1630428_234ffe5806b44c768267a246624c02e4.jpg
  • $$I > II > III$$
  • $$II > III > I$$
  • $$I > III > II$$
  • $$III > II > I$$
Which one of the following compounds is most acidic?
  • phenol
  • Trichoroacetaldeyde
  • Trichloroacetic acid
  • Benzoic acid
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
0:0:1


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