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

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
The boiling point of alcohol are  _________  than corresponding thiols.
  • More
  • Same
  • Either of these
  • Less
Which of the following is most soluble in water?
  • n-butyl alcohol
  • Isobutyl alcohol
  • Tertiary butyl alcohol
  • Secondary butyl alcohol
Dehydration of ethanol gives 
  • Acetic acid
  • Ethane
  • Ethylene
  • Acetylene
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
In the following series of chemical reactions, identify Z $$ C_3H_7OH  \quad \xrightarrow [ 160-180^{ 0 }C ]{ Conc.H_{ 2 }SO_{ 4 } } X\xrightarrow [  ]{  Br_2 }Y\xrightarrow [ Excess\ of ]{ Alc. KOH  }  Z $$
  • $$CH_3 - \underset{NH_2}{\underset{\!\!\!\!|}{CH}} - \underset{NH_2}{\underset{\!\!\!\!|}{CH_2}}$$
  • $$CH_3 - \underset{OH}{\underset{\!\!\!\!|}{CH}} - \underset{\!\!\!\!OH}{\underset{\!\!\!\!\!\!\!|}{CH_2}}$$
  • $$CH_3 - \underset{OH}{\underset{|}{C}} = CH_2$$
  • $$ CH_3C \quad \equiv \quad CH $$
Dehydration of 2-butanol yields
  • 1-butene
  • 2-butene
  • 2-butyne
  • both (A) and (B)
Which of the following alcohol does not give a stable compound on dehydration?
  • Ethyl alcohol
  • Methyl alcohol
  • n-propyl alcohol
  • n-butyl alcohol
Primary alcohols on dehydration give 
  • Alkenes
  • Alkanes
  • Both (a) and (b)
  • None of these
Which of the following would undergo dehydration most readily?
  • 1-phenyl-1butanol
  • 2-phenyl-2-butanol
  • 1-phenyl-2-butanol
  • 2-phenyl-1-butanol
Which compound is soluble in water
  • $$ CS_2 $$
  • $$ C_2H_5OH $$
  • $$ CCl_4 $$
  • $$ CHCl_3 $$
Which of the following reagents convert the propene to 1-propanol
  • $$ H_2O, H_2SO_4 $$
  • Aqueous KOH
  • $$ MhSO_4 , NaBH_4/ H_2 O $$
  • $$ B_2H_6, H_2O_2,OH^- $$
The product $$(B)$$ is:
1770549_ff3cf45b4e03435baca7532caa13781e.png
  • All
The major product of (B) is:
Aqueous sulphuric acid reacts with 2-methyl-1-butene togive predominantly
  • Isobutyl hydrogen sulphate
  • 2-methyl-2-butanol
  • 2-methyl-1-butanol
  • Secondary butyl hydrogen sulphate
Which compound is soluble in $$ H_2O $$ 
  • $$ HCHO $$
  • $$ CH_3CHO $$
  • $$ CH_3COCH_3 $$
  • All
Heating ethanol at 443 K with excess concentrated sulphuric acid results in the dehydration of ethanol to give ethane
  • True
  • False
Identify $$Z$$ in the following series:
$$C_2H_5OH \xrightarrow[]{PBr_3} X \xrightarrow[]{alc. \,KOH} \xrightarrow[(ii) H_2O + \text{heat}]{(i) H_2SO_4} Z$$
  • $$CH_2 = CH_2$$
  • $$CH_3 - CH_2OH$$
  • $$CH_3 - CH_2 - O - CH_2 - CH_3$$
  • None
IUPAC name of the compound is:

$$CH_{3} - \underset{CH_{2} CH_{3} \!\!\!\!\!\!\!} {\underset{|}{C}H} - CH_{2} - CHOH - CH_{3} $$ is 
  • $$4$$-Methyl-$$3$$-hexanol
  • Heptanol
  • $$4$$-Methyl-$$2$$-hexanol
  • None of these
Which of the following compound has wrong IUPAC name ?
  • $$CH_{3} - CH_{2} - CH_{2} - COO - CH_{2} CH_{2} $$ ethyl butanoate
  • $$CH_{3} - \underset{CH_3}{\underset{|} {C}H} - CH_{2} - CHO $$ $$3$$-methylbutanal
  • $$CH_{3} - \underset{OH} {\underset{|} {C}H} - \underset{CH_3}{\underset{|} {C}H} - CH_{3} $$ $$2$$-methyl-$$3$$-butanol
  • $$CH_{3} - \underset{CH_3}{\underset{|} {C}H} - \underset{O}{\underset{\parallel} {C}} - CH_{2} - CH_{3} $$ $$2$$-methyl-$$3$$-pentanone
Statement-1: In the fermentation process of molasses, along with yeast, $$(NH_{4})_{2}SO_{4}$$  and $$(NH_{4})_{3}PO_{4}$$ are added.
Statement-2: Both $$(NH_{4})_{3}PO_{4}$$ and $$(NH_{4})_{2}SO_{4}$$ act as food and help in the growth of yeast.
  • Statement-1 is True, statement-2 is True; statement-2 is a correct explanation for statement-1
  • Statement-1 is True, statement-2 is True; statement-2 is NOT a correct explanation for statement-1
  • Statement-1 is True, statement-2 is False
  • Statement-1 is False, statement-2 is True
Teritary alcohol is obtained as major product in

  • $$(CH_{3})_{2}CH-CH=CH_{2}\overset{oxymercution/demercution}{\rightarrow}$$
  • $$(CH_{3})_{3}C-CH=CH_{2}\overset{dilH_{2}SO_{4}}{\rightarrow}$$
  • $$(CH_{3})_{2}CH-CH=CH_{2}\overset{Hydroboration,Oxidation}{\rightarrow}$$
  • All of the above
Which reagent can be used to convert ethanol to diethyl ether?
  • $$Al_{2}O_{3}$$ at $$250^{0}C$$
  • conc. $$H_{2}SO_{4}$$ at $$170^{0}C$$
  • conc. $$H_{2}SO_{4}$$ at $$130^{0}-140^0C$$
  • $$Al_{2}O_{3}$$ at $$350^{0}C$$
Hydrogen chloride and $$SO_{2}$$ are the side products in the reaction of ethanol with thionyl chloride. Which of the following is main product in this reaction?
  • $$C_{2}H_{5}-O-C_{2}H_{5}$$
  • $$C_{2}H_{6}$$
  • $$CH_{3}Cl$$
  • $$C_{2}H_{5}Cl$$
Which of the following substance can be used as a raw material for obtaining alcohol?
  • Potatoes
  • Molasses
  • Maize
  • All of the above
Which of the following catalyst is used in the conversion of water gas and hydrogen into methyl alcohol?
  • $$MnO$$
  • Raney $$Ni$$
  • $$Fe$$
  • $$ZnO-Cr_{2}O_{3}$$
Oxymercuration-demercuration reaction $$(Hg(OAc)_{2}/THF-H_{2}O)$$ followed by $$(NaBH_{4}, C_{2}H_{5}OH)$$ on $$CH_{3}CH=CH_{2}$$ produces:
  • $$CH_{3}CH_{2}CH_{2}CO$$
  • $$CH_{3}CH(OH)CH_{3}$$
  • $$CH_{3}CH(OH)CH_{2}OH$$
  • $$CH_{3}COCH_{3}$$
Hydroboration-oxidation of $$CH_{3}CH= CH_{2}$$ produces:
  • $$CH_{3}CH_{2}CH_{2}OH$$
  • $$CH_{3}CH(OH)CH_{3}$$
  • $$CH_{3}CH(OH)CH_{2}OH$$
  • $$CH_{3}COCH_{3}$$
An industrial method of preparation of methanol is:
  • catalytic reduction of carbon monoxide in presence of $$ZnO-Cr_{2}O_{3}$$
  • by reacting methane with steam at $$900^{0}C$$ with a nickel catalyst
  • by reducing formaldehyde with lithium aluminium hydride
  • by reacting formaldehyde with aqueous sodium hydroxide solution
In which one of the following reagents $$O-H$$ bond fission in alcohol can not take place?
  • Na
  • $$CH_{3}COOH$$
  • $$CH_{3}MgBr$$
  • $$PCl_{5}$$
Which of the following reactions are correctly represented?
Which of the following pairs of reagents will not form ether?
  • $$C_{2}H_{5}Br+C_{2}H_{5}ONa$$
  • $$C_{2}H_{5}Br+CH_{3}ONa$$
  • $$CH_{3}Br+C_{2}H_{5}ONa$$
  • $$C_{2}H_{5}Br+HCOONa$$
Compounds formed from P and Q are, respectively:
42154.PNG
  • Optically active S and optically active pair (T, U)
  • Optically inactive S and optically inactive pair (T, U)
  • Optically active pair (T, U) and optically active S
  • Optically inactive pair (T, U) and optically inactive S
$$(CO+H_{2})+H_{2}\overset {673k,300atm,/Cr_{2}O_{3}-ZnO} {\rightarrow}$$ 
The above shown reaction may by used for manufacture of:
  • $$HCHO$$
  • $$CH_{3}COOH$$
  • $$HCOOH$$
  • $$CH_{3}OH$$
2- phenyl propene on acidic hydration gives :
  • 2-phenyl-2-propanol
  • 2-phenyl-1-propanol
  • 3-phenyl-1-propanol
  • 1-phenyl-2-propanol
$$CH_{3}MgX\overset{CH_{3}COOC_{2}H_{5}}{\rightarrow} A \overset{Na} {\rightarrow} B \overset{C_{2}H_{5}Br}{\rightarrow} C$$
Here, C is :
  • $$C_{2}H_{5}OC_{2}H_{5}$$
  • $$CH_{3}COOC_{2}H_{5}$$
  • $$CH_{3}COOCH_{3}$$
  • $$(CH_{3})_{3}COC_{2}H_{5}$$
How many structures of F are possible?

42989_afaceb628c234d94b62e6bd5caf2d65a.png
  • $$2$$
  • $$5$$
  • $$6$$
  • $$3$$
An organic compound (A) containing C, H and O has a pleasant odour with boiling point $$78^{0}$$. On boiling (A) with concentrated $$H_{2}SO_{4}$$, colourless gas is evolved which decolorizes bromine water and alkaline $$K MnO_{4}$$. The organic compound (A) is :
  • $$C_{2}H_{5}Cl$$
  • $$C_{2}H_{5}COOCH_{3}$$
  • $$C_{2}H_{5}OH$$
  • $$C_{2}H_{6}$$

The structure of compound $$I$$ is:

32372_60352c7742c341b8876aeb5c3e9f47cc.png
Ortho-nitrophenol is less soluble in water than para and meta-nitrophenols because:
  • o- nitrophenol is more volatile in steam than those of m- and p- isomers.
  • o- nitrophenol shows intramolecular $$H-$$bonding.
  • o-nitrophenol shows intermolecular $$H-$$bonding.
  • none of these.

The main product of the above reaction is:
78493_e0316cdf09d04d38977eb712f7075c94.PNG
On oxymercuration-demercuration, the given compound produces the major product:
99826.jpg
Which reagent converts propene to propan-1-ol?
  • $${ H }_{ 2 }O,\hspace{0.5mm} { H }_{ 2 }S{ O }_{ 4 }$$
  • $${ B }_{ 2 }{ H }_{ 6 },\hspace{0.5mm} { H }_{ 2 }{ O }_{ 2 },\hspace{0.5mm}OH^-$$
  • $$Hg(OAc{ ) }_{ 2 },\hspace{0.5mm} NaB{ H }_{ 4 }/{ H }_{ 2 }O$$
  • Aq. $$KOH$$
Identify the correct option(s) related with the physical properties of the unknown compounds [X] and [Y] formed as major and minor product respectively in the given reaction.

72221.jpg
  • Water solubility of [Y] is greater than [X]
  • Boiling point of [Y] is greater than [X]
  • Melting point of [Y] is greater than [X]
  • [X] is more volatile than [Y]
$$Propan-1-ol$$ can be prepared from propene by :
  • $$H_2O / H_2SO_4$$
  • $$Conc. H_2SO_4$$
  • $$B_2H_6$$ followed by $$H_2O_2/OH$$
  • $$CH_3CO_2H / H_2SO_4$$
Which one of the following compounds is most acidic?
Among the following four compounds the acidity order is:
(a) Phenol 
(b) methyl phenol
(c) meta nitrophenol
 (d) para-nitrophenol
  • $$c > d > a > b$$
  • $$a > d > c > b$$
  • $$b > a > c > d$$
  • $$d > c > a > b$$
Ethanol $$\xrightarrow{PBr_3}X\xrightarrow{alc.KOH}Y\xrightarrow[(ii)H_2O,Heat]{(i)\;H_2SO_4\;room\;temperature}Z$$;
The product $$ Z$$ in the above reaction is:
  • $$CH_3CH_2\!-\!OH$$
  • $$CH_2 = CH_2$$
  • $$CH_3CH_2\!-\!O\!-\!CH_2CH_3$$
  • $$CH_3CH_2\!-\!O\!-\!SO_3H$$
Identify the correct sequence of given steps for the conversion of calcium carbide to methyl alcohol.
(a) Reaction with aqueous KOH
(b) Hydrolysis
(c) Reaction with soda lime
(d) Reaction with $$HgSO_4/ H_2SO_4$$
(e) Potassium dichromate, $$K_2Cr_2O_7$$
(f) Reaction with $$PCl_5$$
  • b d e c f a
  • b d c a f e
  • b f d e a c
  • d b c e f a
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