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NEET Chemistry MCQ
Alcohols, Phenols And Ethers Mcq Neet Chemistry
Quiz 5
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Q.1
Excess of glycol when dehydrated gives ... ..
0%
a) ethylene oxide
0%
b) 1,4 dioxan
0%
c) ethanol
0%
d) acrolein
Explanation
Answer : (b)
Q.2
C2H5OH can be differentiated from CH3OH by ... ... [ MPCET 1994]
0%
a) Reaction with HCl
0%
b) Reaction with NH3
0%
c) Iodoform test
0%
d) Solubility in water
Explanation
C2H5OH gives iodoform test, while CH3OH do not Answer : (c)
Q.3
Propanon is the product obtained by dehydrogenation of ... .... [ KCET CET 2001]
0%
a) 2-Propanol
0%
b) 1-Propanol
0%
c) Iso- butyl alcohol
0%
d) Propanethiol
Explanation
CH3 - CHOH -CH3 → CH3 - CO - CH3 + H2 Answer : (a)
Q.4
An organic compound (A) reacts with sodium metal and forms (B). On heating with conc. H2SO4 (A) gives diethyl ether. (A) and (b) are respectively .... ...
0%
a) C2H5OH and C2H5ONa
0%
b) C3H7OH and CH3ONa
0%
c) CH3OH and CH3ONa
0%
d) C4H9OH and C4H9ONa
Explanation
Reaction with sodium C2H5 OH + Na → C2H5ONa Reaction with H2SO4 2C2H5OH → C2H5 - O - C2H5 Answer : (a)
Q.5
Which is more acidic? ... .. [ Orissa JEE 2004]
0%
a) o-Cresol
0%
b) p-Nitrophenol
0%
c) Phenol
0%
d) m-Cresol
Explanation
An electron withdrawing group increases the acidic strength of phenol Answer : (b)
Q.6
Phenol is more acidic than cyclohexanol because
0%
a) Benzene ring exhibits resonance
0%
b) Cyclohexane ring shows resonance
0%
c) Phenol is poor in hydrogen
0%
d) Cyclohexanol is rich in hydrogen
Explanation
Answer : (a)
Q.7
Which of the following is most volatile?
0%
a) o-Nitrophenol
0%
b) p-Nitrophenol
0%
c) m-Nitrophenol
0%
d) All of the above
Explanation
o-Nitrophenol shows low melting point. Has volatile nature because of intermolecular hydrogen bonding Answer : (a)
Q.8
What is the major product obtained when phenol is treated with chloroform and aqueous alkali?
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer : (a)
Q.9
Which of the following compounds is obtained on passing ethanol vapours on heated Al2O3? ... ..[ MPPET 2001]
0%
a) Ethyl ether
0%
b) Acetone
0%
c) Ethane
0%
d) Ethanol
Explanation
When ethanol vapours passes over Al2O3 at temperature 240-250° it gives Ethyl ether 2C2H5OH → C2H5 - O - C2H5 Answer : (a)
Q.10
Which of the following can not prepared using Willamson's synthesis?
0%
a) Methoxybenzene
0%
b) Benzyl-p-nitrophenyl ether
0%
c) Methyl-tert-butyl ether
0%
d) Di-tert-butyl ether
Explanation
Formation of di-tertiary-butyl ether requires the reaction of sodium t-butoxide with t-butyl halide. But tertiary halides prefer to undergo elimination reaction rather than Williamson's reaction in presence of alkoxide ion Answer : (d)
Q.11
tert- Butyl methyl ether on heating with HI gives a mixture of ... ....
0%
a) tert- Butyl alcohol and methyl iodide
0%
b) tert- Butyl iodide and methanol
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c) iso- Butylene and methyl iodide
0%
d) iso- Butylene and methanol
Explanation
Answer : (b)
Q.12
Which cannot be produced by acidic dehydration of alcohols?
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a) Ether
0%
b) Aldehyde
0%
c) Alkyl hydrogen sulphate
0%
d) Alkene
Explanation
Answer : (b)
Q.13
Which of the following does not give yellow ppt. with I2/NaOH? ... ...[ MPPET 1996]
0%
a) C2H5OH
0%
b) CH3CHO
0%
c) CH3COCH3
0%
d) HCHO
Explanation
Answer : (d)
Q.14
Baeyer's reagent .... ..... [ MPCET 1994]
0%
a) Alkaline KMnO4
0%
b) Ammonical AgNO3
0%
c) Ammonical CuSO4
0%
d) CaSO4/Ca(OH)2
Explanation
Answer : (a)
Q.15
To prepare 3-ethylpentan-3-ol, the reagents needed are .... [ Chd. CET 1998]
0%
a) CH3CH2MgBr + CH3COCH2CH3
0%
b) CH3MgBr + CH3CH2CH2COCH2CH3
0%
c) CH3CH2MgBr + CH3CH2COCH2CH3
0%
d) CH3CH2CH2MgBr + CH3COCH2CH3
Explanation
Answer : (c)
Q.16
Conversion of ethyl alcohol into acetaldehyde is an example of ... .... [ Punjab CET 1997]
0%
a) Reduction
0%
b) Molecular rearrangement
0%
c) Hydrolysis
0%
d) Oxidation
Explanation
Answer : (d)
Q.17
The reaction between alcohol and carboxylic acids is called ... ..[ Pub CET 1994]
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a) Esterification
0%
b) Hydrolysis
0%
c) Saponification
0%
d) Hydrogenation
Explanation
Answer : (a)
Q.18
The reaction of aromatic acyl chloride and phenol in the presence of a base NaOH or pyridine is called ... ....[ AFMC 1998]
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a) Kolbe's reaction
0%
b) Perkin's reaction
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c) Sandmeyer's reaction
0%
d) Schotten Baumann reaction
Explanation
Reaction of aromatic acyl chloride with phenol in presence of base NaOH or pyridine is called Schotten-Baumann reaction Answer : (d)
Q.19
Ethylene may be obtained by the treatment of concentrated H2SO4 and X at 160-170°C. X is ... ... [ MPPET 2001]
0%
a) C2H5OH
0%
b) CH3OH
0%
c) C3H7OH
0%
d) (CH3)2CHCH2OH
Explanation
At 160-170°C and in presence of H2SO4 reaction of ethanol is C2H5OH → CH2 - CH2 ( Ethylene) Answer : (a)
Q.20
Which of the following process is employed to convert alkyl halide into alcohol?
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a) Addition
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b) Substitution
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c) Dehydrohalogenation
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d) Molecular rearrangement
Explanation
Nucleophilic substitution R - Cl + OH- → R - OH + Cl- Answer : (b)
Q.21
The order of reactivity of halogen acids for reaction with C2H5OH is ... ... [ MPPET 1996]
0%
a) HCl > HBr > HI
0%
b) HI > HBr > HCl
0%
c) HBr > HI > HCl
0%
d) HBr > HCl > HI
Explanation
Since the bond strength of halogen acids is H-Cl > H - Br> H - I The order of their reactivity with C2H5OH is as given in option 'b' Answer : (b)
Q.22
Which of the following combinations can be used to synthesize iso- propyl alcohol? [ karnataka CET 2004]
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a) CH3MgI nad CH3COCH3
0%
b) CH3MgI and C2H5OH
0%
c) CH3MgI and CH3COOC2H5
0%
d) CH3MgI and HCOOC2H5
Explanation
Answer : (d)
Q.23
Which bond of ethyl alcohol undergoes cleavage reaction with sodamide? ... .. [ IIT 1988]
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a) C - C
0%
b) C - O
0%
c) C - H
0%
d) O - H
Explanation
R - O - H + NaNH2 → R -ONa + NH3 Electronegativity difference in O - H bond is maximum thus it undergoes heterolytic cleavage most readily Answer : (d)
Q.24
Which of the following reagents will convert propanoic acid to propan-1-ol?
0%
a) KMnO4
0%
b) MnO2
0%
c) Cr2O3
0%
d) LiAlH4
Explanation
Hydrogenation converts acid to alcohol LiAlH4 provided hydrogen for reaction CH3-CH2-COOH → CH3CH2CH2-OH Answer : (d)
Q.25
Anisole is product obtained from phenol by the reaction known as ....
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a) Coupling
0%
b) Etherification
0%
c) Oxidation
0%
d) Esterification
Explanation
Answer : (b)
Q.26
A compound is soluble in conc. H2SOit does not decolourise bromine in CCl4 but is oxidised by chromic anhydride in aqueous sulphuric acid within two seconds, turning orange solution to blue green, then opaque. The original solution contains
0%
a) A secondary alcohol
0%
b) An alkene
0%
c) An ether
0%
d) A primary alcohol
Explanation
Since the given compound is soluble in H2SO4, the compound should be either alkene, alcohol or ether. It does not decolourise bromine, which shows that compound cannot be alkene. Compound is oxidised by chromic anhydride in aqueous H2SO4 i.e. compound cannot be an ether. As the oxidation is very fast, the compound (alcohol) may be a primary alcohol Answer : (d)
Q.27
Which statement is not correct about alcohols?
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a) Ethyl alcohol is heavier than water
0%
b) Ethyl alcohol evaporates more quickly
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c) Alcohol with less number of carbon atoms is more soluble in water than alcohol with more number of carbon atoms
0%
d) Alcohol produces H2 by reaction with sodium metal
Explanation
Answer : (a)
Q.28
Which of the following is not formed when glycerol reacts with HI? ... ... [ DEC 1994]
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a) CH2 = CH - CH2I
0%
b) CH2OH - CHI - CH2OH
0%
c) CH3 - CH = CH2
0%
d) CH3 - CHI - CH3
Explanation
During the reaction of glycerol with HI, all are formed except CH2OH - CHI - CH2OH Answer : (b)
Q.29
Ethyl alcohol can be used for preparation of which of the following? ... .. [ Punjab CET 1994]
0%
a) Ethyl acetate
0%
b) Ethylene
0%
c) Acetic acid
0%
d) All of these
Explanation
Answer : (d)
Q.30
Ethylene reacts with 1% cold alkaline KMnO4 to give ... ... [ Haryana CEET 1998]
0%
a) Oxalic acid
0%
b) Acetone
0%
c) Ethylene glycol
0%
d) Formaldehyde
Explanation
CH2 = CH2 + KMnO4 → CH2OH - CH2OH (Ethylene glycol) Answer : (c)
0 h : 0 m : 1 s
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