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

Ethene reacts with $$Y$$ to produce ethanol.
$$ethene + Y \rightarrow ethanol$$
What is $$Y$$?
  • Hydrogen
  • Oxygen
  • Steam
  • Yeast
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
What is the major product formed when compound $$Q$$ is warmed with excess $$HBr$$?
1649118_055f3cdde26d438fa0d85ce10f92f973.jpg
An olefin may be converted into alcohol by:
  • $$B_{2}H_{6}$$ and $$H_{2}O_{2}$$
  • $$LiAlH_{4}$$
  • $$Acidic \ KMnO_{4}$$
  • $$HOCl$$
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
State whether the following statement is True or False.
$$C_2H_5OH$$ can accept a proton to give protonated, $$C_2H_5\overset{+}{O}H_2$$, i.e., it can act as an acid.
  • True
  • False
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
State whether the following statement is True or False.
Ethylene can be used for the synthesis of ethyl alcohol.
  • True
  • False
The boiling point of thioether are ________ than those of ethers.
  • higher
  • lower
  • equal
  • nearly same
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
Methyl phenyl ether can be obtained by reacting:
  • phenolate ions and methyl iodide
  • methoxide ion and bromobenzene
  • methanol and phenol
  • bromobenzene and methyl bromide
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?
  • $$Fe$$
  • $$Cr_2O_3/ZnO$$
  • $$V_2O_5$$
  • $$Al_2O_3$$
The boiling point of ethanol is higher as compared to the boiling point of diethyl ether though both have the same molecular formula. This is due to:
  • Resonance
  • H-bonding
  • R-group
  • Covalent bonding
Wood spirit if known as?
  • Ethanol
  • Methanol
  • Acetone
  • Benzene
State, whether the following statements are True or False:
Ethers are not affected by atmosphere. 
  • True
  • False
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:
  • $$HCHO$$
  • $$CH_3COOH$$
  • $$HCOOH$$
  • $$CH_3OH$$
State, whether the following statements are True or False:
$$C_2HSOC_2H5$$ is a linear molecule having zero dipole moment.
  • True
  • False
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?
  • $$CH_3CH_2CH_2CH_2CH_2OH$$
An organic compound 'X' on treatment with acidified $$K_2Cr_2O_7$$ gives a compound 'Y' which reacts with $$I_2$$ and $$Na_2CO_3$$ to form tri-iodomethane. The compound 'X' is?
  • $$CH_3OH$$
  • $$CH_3COCH_3$$
  • $$CH_3CHO$$
  • $$CH_3CHOHCH_3$$
Boiling point of $$C_2H_5OH$$ is higher as compared to $$C_2H_5SH$$ on account of:
  • Association
  • Dissociation
  • Low molecular mass
  • None of these
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?
  • $$(CH_3)_2CH-CH_2OH$$
  • $$CH_3CH_2CH_2OH$$
  • $$CH_3-CH(OH)-CH_2CH_3$$
  • $$(CH_3)_3C-OH$$
The correct order of boiling points for primary $$(1^o)$$, secondary $$(2^o)$$ and tertiary alcohol $$(3^o)$$ is:
  • $$1^o > 2^o > 3^o$$
  • $$3^o > 2^o > 1^o$$
  • $$2^o > 1^o > 3^o$$
  • $$2^o > 3^o > 1^o$$
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. $$H_2SO_4$$?
  • $$CH_3-CH_2-CH_2-CH_2-OH$$
Butane-2-ol is:
  • Primary alcohol
  • Secondary alcohol
  • Tertiary alcohol
  • Aldehyde
Cresols are 
  • Hydroxy toluenes
  • Dihydric phenols
  • Trihydric phenols
  • Trihydric alcohols
IUPAC name of tertiary butyl alcohol is
  • Butan-1-ol
  • Butan-2-ol
  • 2-methyl propan-1-ol
  • 2-methyl propan-2-ol
Wood spirit is known as 
  • Methanol
  • Ethanol
  • Acetone
  • Benzene
The IUPAC name of picric acid is
  • $$2,4,6-$$trinitrophenol
  • $$2,4,6-$$trinitrobenzoic acid
  • $$4-$$nitrophenol
  • None of these
The $$IUPAC$$ name of compound $$\begin{matrix} \quad \quad O{ CH }_{ 3 } \\ | \\ { CH }_{ 3 }-{ CH }_{ 2 }-CH-{ CH }_{ 2 }-OH \end{matrix}$$ is
  • $$2-$$methoxy$$-1-$$butanol
  • $$3-$$methoxy$$-1-$$butanol
  • $$2-$$methoxy$$-1-$$butanol
  • $$1,2-$$methoxy$$-$$butanol
The structural formula of cyclohexanol is
3-pentanol is a:
  • Primary alcohol
  • Secondary alcohol
  • Tertiary alcohol
  • None of these
General formula of primary alcohol is 
  • $$>CHOH$$
  • $$-CH_2OH$$
Which of the following is phenolic 
  • Phthalic acid
  • Phosphoric acid
  • Picric acid
  • Phenylacetic acid
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
Boiling point of alcohol is comparatively higher than that corresponding alkane due to:
  • Intermolecular hydrogen bonding
  • Intramolecular hydrogen bonding
  • Volatile nature
  • None of these
Wine (alcoholic beverages) contains:
  • $$ CH_3OH $$
  • Glycerol
  • $$ C_2H_5OH $$
  • 2-propanol
The reaction of $$ C_2H_5OH $$ with $$ H_2SO_4 $$ does not give  
  • Ethylene
  • Diethyl ether
  • Acetylene
  • Ethyl hydrogen sulphate
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 $$ H_2O_2 $$
  • $$ CH_3CO_2H/H_2SO_4 $$
Acetyl bromide reacts with excess of $$ CH_3MgI $$ following by treatment with a saturated of $$ NH_4Cl$$ gives 
  • 2-methyl-2-propanol
  • Acetamide
  • Acetone
  • Acetyl iodide
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