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NEET Chemistry MCQ
Alcohols, Phenols And Ethers Mcq Neet Chemistry
Quiz 9
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Q.1
On oxidation, an alcohol gives an aldehyde having the same number of carbon atoms as that of alcohol. The alcohol is ... ....
0%
a) 1° alcohol
0%
b) 2° alcohol
0%
c) 3° alcohol
0%
d) none of these
Explanation
Answer : (a)
Q.2
The starting material for the preparation of CH3I in one step reaction is
0%
a) CH3OH
0%
b) C2H5OH
0%
c) CH3CHO
0%
d) CH3COCH3
Explanation
CH3 + HI → CH3I Answer : (a)
Q.3
Vinyl carbinol is ... ...
0%
a) CH3C(OH) = CH2
0%
b) HOH2C - CH = CH2
0%
c) CH3 - CH = CH - OH
0%
d)
Explanation
Answer : (b)
Q.4
Glycol is prepared industrially by the following reactions
0%
a)
0%
b)
0%
c)
0%
d) none of the above
Explanation
Option 'b' is industrial method of preparation of glycol Answer : (b)
Q.5
A neutral compound gives red colour with ceric ammonium nitrate. It suggests that the compound has .... ....
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a) ketone group
0%
b) aldehyde group
0%
c) ether
0%
d) alcoholic group
Explanation
This is a characteristic test for alcoholic group Answer : (d)
Q.6
Lucas reactant produces cloudiness immediately with
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a) n-butanol
0%
b) isopropanol
0%
c) n-propanol
0%
d) tertiary butanol
Explanation
Reactivity order of -OH towards Lucas reagent is Tertiary > Secondary > Primary alcohol Answer : (d)
Q.7
on Q247) Y is
0%
a) CH2OH - CH2OH
0%
b) CH3OH
0%
c) CH3CH2OH
0%
d) CH2OH - CH2OH
Explanation
CH ≡ CH on oxidation gives CHOCHO(X) on reduction of CHOCHO gives CH2OHCH2OH Answer : (d)
Q.8
Alcohol is not used in making
0%
a) benzene
0%
b) acetaldehyde
0%
c) chloroform
0%
d) chloral
Explanation
Answer : (a)
Q.9
han One Correct Answers Q249) Neutral ferric chloride gives violet colour with
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a) phenol
0%
b) cresol
0%
c) catechol
0%
d) none of these
Explanation
Answer : (a,b and d )
Q.10
CH3COOH reacts rapidly with .... ..
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a) (CH3)2CHOH
0%
b) CH3CH2OH
0%
c) (CH3)3COH
0%
d) all of these
Explanation
Reactivity order for H-atoms of alcohol is Primary > Secondary > Thertiary Answer : (b)
Q.11
Which could not be obtained from wood?
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a) CH3OH
0%
b) C2H5OH
0%
c) Wood tar
0%
d) Wood charcoal
Explanation
Pyroligneous acid obtained destructive distillation of wood contains mainly acetic acid (9-10%), methyl alcohol (2-2.5%) and acetone about 0.5%; the other distillation products are wood gas, wood charcoal, wood tar. Answer : (b)
Q.12
Ether in contact with air for a long time from peroxides. The presnce of peroxide in ether can be tested by adding Fe+2 ion in it and then adding ... ...
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a) KI
0%
b) SnCl2
0%
c) HgCl2
0%
d) KCNS
Explanation
Peroxide oxidizes Fe2+ to Fe3+ which gives red colour with KCNS Answer : (d)
Q.13
For drying ether, sodium metal can be used, but it cannot be used for drying ethyl alcohol because .... ..
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a) ether reacts easily with Na
0%
b) Na is very reactive
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c) ethyl alcohol reacts with sodium metal
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d) none of the above
Explanation
Answer : (c)
Q.14
han One Correct Answer Q254)Phenol is less acidic than
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a) acetic acid
0%
b) p-methoxyphenol
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c) p-nitrophenol
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d) ethanol
Explanation
Answer : (a, c)
Q.15
Which alcohol is most acidic?
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a) Ethanol
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b) Methanol
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c) Isopropyl alcohol
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d) t-butyl alcohol
Explanation
Due to +IE of alkyl group reactivity of Primary > Secondary > Tertiary Also CH3OH is more acidic than C2H5OH due to more +IE of -C2H5 group Answer : (b)
Q.16
C2H5OH cannot be dried by anhydrous CaCl2, because .... ...
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a) C2H5OH is soluble in water
0%
b) C2H5OH reacts with CaCl2
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c) CaCl2 is soluble in water
0%
d) none of the above
Explanation
4C2H5OH + CaCl2 → CaCl2.4C2H5OH Answer : (b)
Q.17
An organic compound dissolved in dry benzene evolved hydrogen on treatment with sodium. It is ... ....
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a) a ketone
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b) an alcohol
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c) a tertiary amine
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d) an aldehyde
Explanation
Answer : (b)
Q.18
Glycerol on oxidation with bismuth nitrate mainly gives ....
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a) mesoxalic acid
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b) oxalic acid
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c) tartronic acid
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d) glycerinc acid
Explanation
Answer : (a)
Q.19
How many isomers of C5H11OH will be primary alcohols?
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a) 2
0%
b) 3
0%
c) 4
0%
d) 5
Explanation
CH3CH2CH2CH2CH2OH; (CH3)2CHCH2CH2OH; (CH3)3CCH2OH; Answer : (c)
Q.20
Alcoholic fermentation by starch or sugar is brought about bt ... ...
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a) Sodium bicarbonate
0%
b) yeast
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c) CO2
0%
d) phosphates
Explanation
Answer : (b)
Q.21
Which of the following statement is incorrect?
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a) Urease is an enzyme
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b) Enzymes can catalyse any reaction
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c) Enzymes are in colloidal state
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d) Enzymes are catalyst
Explanation
Answer : (b)
Q.22
An aldehyde on treatment with Zn/HCl yields
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a) 1° alcohol
0%
b) 2° alcohol
0%
c) 3° alcohol
0%
d) none of these
Explanation
Reaction aldehyde gives alcohol Answer : (a)
Q.23
A compound X with molecular formula C3H8O can be oxidised to a compound Y with the molecular formula C3H6O2 . X is most likely to be
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a) Ketone
0%
b) Primary alcohol
0%
c) aldehyde
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d) secondary alcohol
Explanation
Number of carbon in acid are same of compound X. thus X must be primary alcohol. Secondary alcohol give one carbon less in acid Answer : (b)
Q.24
Glycerol on reacting with sodium gives .... ....
0%
a) monosodium glycerollate
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b) disodium glycerollate
0%
c) trisodium glycerollate
0%
d) none of the above
Explanation
Answer : (b)
Q.25
Chlorex which is good solvent for aromatic impurities is .... ...
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a) dichlorodiethyl ether
0%
b) dichlorodimethyl ether
0%
c) monochloro ether
0%
d) diethyl ether
Explanation
Chlorex is industrial name for dichlorodiethyl ether Answer : (a)
Q.26
On boiling with conc. hydrobromic acid, phenyl ethyl ether will yield
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a) bromobenzene and ethane
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b) bromobenzene and ethanol
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c) phenol and ethane
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d) phenol and ethyl bromide
Explanation
C6H5OC2H5 + HBr → C6H5OH + C2H5Br Answer : (d)
Q.27
When an ether is treated with P2S5 we get ... ...
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c) thio-alcohol
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a) thio-ether
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b) thio-ester
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d) thio-aldehyde
Explanation
5R-OR + P2S5 → 5RSR + P2O5 Answer : (a)
Q.28
Which will not form yellow precipitate on heating with an alkaline solution of iodine?
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a) CH3OH
0%
b) CH3CH2OH
0%
c) CH3CH2CHOHCH3
0%
d) CH3CH2CHOHCH3
Explanation
CH3OH does not contain CH3CHOH - unit Answer : (a)
Q.29
Tertiary alcohol is obtained when Grignard reagent reacts with .... ...
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a) Butanone
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b) Propanone
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c) acetone
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d) all of the above
Explanation
Answer : (d)
Q.30
Ethyl alcohol reacts with HCl but not with HCN because
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a) C2H5OH is weak base and HCN is weak base
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b) HCl is strong acid and C2H5OH is weak base
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c) C2H5OH is strong acid and HCN is weak acid
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d) C2H5OH is weak acid and HCN is strong acid
Explanation
Weak base with strong acid Answer : (b)
0 h : 0 m : 1 s
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