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NEET Chemistry MCQ
Alcohols, Phenols And Ethers Mcq Neet Chemistry
Quiz 14
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Q.1
The correct order of solubility of 1°, 2° and 3° alcohol in water is ... ....
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a) 3° > 2° > 1°
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b) 1° > 2° > 3°
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c) 3° > 1° > 2°
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d) none of these
Explanation
More is the branching in molecule, lesser is the surface area and weaker are intermolecular forces Answer : (b)
Q.2
Vapour of an alcohol were passed over hot reduced copper. It gave an olefin. The alcohol is ....
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a) 1°
0%
b) 2°
0%
c) 3°
0%
d) none of these
Explanation
Tertiary alcohol are dehydrated on passing over heated Cu; Primary and secondary are dehydrogenated Answer : (c)
Q.3
onMore Than One Correct Answer Q394) The reaction is believed to occur through the formation of
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a)
0%
b)
0%
c)
0%
d) none of the above
Explanation
Answer : (b,c)
Q.4
In the reduction reaction of following reaction the catalyst used is R - CHO + H2 → RCH2OH
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a) Ni
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b) Pd
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c) Pt
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d) all of these
Explanation
Answer : (d)
Q.5
The following substance can be used as a raw material for obtaining alcohol
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a) maize
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b) molasses
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c) potato
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d) all of these
Explanation
Answer : (d)
Q.6
Absolute alcohol contains .... .....
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a) 100% C2H5OH
0%
b) 5% H2O
0%
c) 10% H2O
0%
d) 40% H2O
Explanation
Answer : (a)
Q.7
Assertion: A small amount of ethanol is added to CHCl3 bottles Reason: It acts as negative catalyst for the oxidation of CHCl3 to COCl2
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
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c) Assertion is true but, Reason is false
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d) Assertion is false but, Reason is true
Explanation
Answer : (a)
Q.8
An organic compound A reacts with sodium metal and forms B. On heating with conc. H2SOA give diethyl ether. So A and B are ... ....
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a) CH3OH and CH3Ona
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b) C2H5OH and C2H5ONa
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c) C3H7OH and CH3Ona
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d) C4H9OH and C4H9ONa
Explanation
Answer : (b)
Q.9
Assertion: Alcohols cannot be dried by CaCl2 Reason:CaCl2 forms solvated molecules with alcohol
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
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c) Assertion is true but, Reason is false
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d) Assertion is false but, Reason is true
Explanation
Answer : (a)
Q.10
The b.p. of alcohols are .... than corresponding thiols
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a) more
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b) less
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c) same
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d) either of these
Explanation
Alcohols although possess low molar mass than thiol but they show H-bonding Answer : (a)
Q.11
Assertion:Methanol is stronger acid than water Reason:All alcohols are stronger acid than water
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
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c) Assertion is true but, Reason is false
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d) Assertion is false but, Reason is true
Explanation
Answer : (c)
Q.12
Ether fire can be extinguished by .... ....
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a) sand
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b) pyrene
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c) CO2
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d) all of these
Explanation
Answer : (d)
Q.13
Alcohols are neutral in character where thio-alcohols are ... ... in character.
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a) weakly acidic
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b) strongly acidic
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c) basic
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d) neutral
Explanation
Alcohols are alkyl derivative of neutral H2O. Thiol are derivative of weak acidic H2S Answer : (a)
Q.14
The number of isomeric alcohol of formula C4H10O is ... ...
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a) 2
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b) 3
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c) 4
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d) 5
Explanation
Butanol-1, butanol-2, 2-methylpropanol-1, 2-methylpropanol-2 Answer : (c)
Q.15
RCH2CH2OH can be converted to RCH2CH2COOH by the following sequence of steps
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a) HCN, PBr3, H3O+
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b) PBr3,KCN, H3O+
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c) KCN, H3O+
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d) PBr3,KCN, H2/Pt
Explanation
Answer : (b)
Q.16
Na reacts rapidly with
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a) primary alcohol
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b) secondary alcohol
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c) tertiary alcohol
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d) none of these
Explanation
Answer : (a)
Q.17
Dunstan's test is used for identification of ... ...
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a) Carbonyl compound
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b) alcohol
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c) acetone
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d) glycerol
Explanation
Glycerol decolourise pink colour of phenolphthalein in borax solution in cold, which however regenerates on heating Answer : (d)
Q.18
When C2H5OH is mixed with ammonia and passed over heated alumina, the compound formed is .... .....
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a) CH3OCH3
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b) C2H5NH2
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c) C2H4
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d) CH3OCH3
Explanation
Answer : (b)
Q.19
Assertion:Acid catalysed dehydration of t-butanol is faster than n-butanol Reason: The order of stability of carbocation is 3° > 2° > 1°
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
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c) Assertion is true but, Reason is false
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d) Assertion is false but, Reason is true
Explanation
Answer : (a)
Q.20
Lubricant used in watch is .... .....
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a) coconut oil
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b) pine oil
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c) animal oil
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d) glycerol
Explanation
Answer : (d)
Q.21
Diethyl ether on treatment with Cl2 in presence of sunlight gives
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a) 1,1-dichlorodiethyl ether
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b) perchlorodiethyl ether
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c) trichlorodiethyl ether
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d) trichloroacetaldehyde
Explanation
C2H5OC2H5 + Cl2( in presence of sunlight) → C2Cl5.O.C2Cl5 Answer : (b)
Q.22
In the presence of an acid catalyst, two alcohol molecules, will undergo dehydration to give.... .....
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a) ether
0%
b) anhydride
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c) unsaturated hydrocarbon
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d) ether
Explanation
ROH + HOR → ROR Answer : (d)
Q.23
Peppermint can be extracted from plant sources by using solvents like .... ....
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a) H2O
0%
b) CH3COOH
0%
c) NH3
0%
d) C2H5OH
Explanation
Peppermint is soluble in alcohol Answer : (d)
Q.24
Ethers are quite stable towards ...
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a) oxidizing and reducing agent
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b) Na metal
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c) base
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d) all of these
Explanation
Ethers acts as Lewis base only towards strong acids Answer : (d)
Q.25
Glycerol on oxidation with conc. HNO3 mainly yields ....
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a) tartonic acid
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b) glyceric acid
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c) mesoxalic acid
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d) both (a) and (b)
Explanation
Note excess nitric acid with sulphuric acid gives glycerol trinitrate Answer : (d)
Q.26
Ethers are not distilled to dryness for fear of explosion. This is due to formation of .... ...
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a) alcohol
0%
b) oxides
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c) ketones
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d) peroxides
Explanation
Peroxides decompose violently on heating Answer : (d)
Q.27
han One Correct Answer Q418) Chromic anhydride in H2SO4 is turned blue by
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a) 1° alcohol
0%
b) 2° alcohol
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c) 3° alcohol
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d)
Explanation
Answer : ( a, b, and d)
Q.28
To prepare 2-propanol from CH3MgI, the other chemical required is .... ......
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a) CO2
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b) C2H5OH
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c) CH3CHO
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d) HCHO
Explanation
Answer : (c)
Q.29
Ether are made free from peroxide linkage on distilling impure sample with .... ...
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a) conc. NHO3
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b) conc. HCl
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c) conc. H2SO4
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d) none of these
Explanation
Peroxide are decomposed on heating with H2SO4 Answer : (c)
Q.30
If there be a compound of the formula CH3C(OH)3, which one of the following compounds would be obtained from it .... ....
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a) Ethanol
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b) Acetic acid
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c) Methanol
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d) Formaldehyde
Explanation
Presence of two or more OH group on a carbon atom makes it unstable and compound loses H2O molecule Answer : (b)
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