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NEET Chemistry MCQ
Alcohols, Phenols And Ethers Mcq Neet Chemistry
Quiz 10
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Q.1
The decreasing order of boiling points of 1°, 2°, 3° alcohol is .. ...
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a) 1° > 2° > 3°
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b) 3° > 2° > 3°
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c) 2° > 1° > 3°
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d) none of these
Explanation
Branching give rise to decrease in surface area and thus intermolecular forces are lowered Answer : (a)
Q.2
CH2ClCH2OH is stronger acid than CH3CH2OH because
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a) +IE of Cl disperses -ve charge on O-atom to produce more stable anion
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b) - IE of Cl disperses -ve charge on O-atom to produce more stable anion
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c) -IE of Cl increases -ve charge on O-atom to alcohol
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d) none of the above
Explanation
Negative charge on oxygen is dispersed and thus, ion is more stable Answer : (b)
Q.3
A compound X, when boiled with Na2CO3 solution gives glycol as the product. What is X?
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a) Ethylene
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b) Ethylene oxide
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c) Ethyl bromide
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d) Ethyl hydrogen sulphate
Explanation
Answer : (b)
Q.4
Metal alkoxides contain .... ....
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a) metal-oxygen bond
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b) metal-carbon bond
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c) metal-methyl bond
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d) none of these
Explanation
Metal alkoxide is R - O- Na+ Answer : (a)
Q.5
Which of the following compound is oxidised to prepare methyl ethyl ketone?
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a) 1-butanol
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b) tert-butyl alcohol
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c) 2-propanol
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d) 2-butanol
Explanation
Answer : (d)
Q.6
Absolute ethanol cannot be obtained by simple fraction of solution of ethanol and water because
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a) their boiling points are very near
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b) ethanol remains dissolved in water
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c) they form a constant boiling mixture
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d) ethanol molecules are solvated
Explanation
Alcohol for azeotropic mixture with water Answer : (c)
Q.7
Saccharification is the process of conversion of .... ..
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a) Starch into sugar
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b) starch into alcohol
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c) sugar into alcohol
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d) none of these
Explanation
In Saccharification enzyme catalysed conversion of starch into sugar Answer : (a)
Q.8
han One Correct Answer Q279) Ethyl alcohol is obtained when ethyl chloride is boiled with ... ...
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a) water
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b) aqueous KOH
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c) alcoholic KOH
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d) H2O2
Explanation
Answer : (a and b )
Q.9
Pyroligneous acid contains ... .....
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a) CH3COCH3 (10%), C2H5OH (2.5%), CH3OH (0.5%)
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b) CH3COOH (10%), CH3OH (2.5%), CH3COCH3 (0.5%)
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c) C2H5OH (110%), CH3(2.5%), CH3COCH3 (0.5%)
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d) none of the above
Explanation
Pyroligneous acid obtained during 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.10
Alcohol is sometimes used in ... ...
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a) paints
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b) weighing
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c) thermometer
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d) baking powder
Explanation
Answer : (c)
Q.11
Which of the following is least soluble in water?
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a) C2H5OH
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b) C3H7OH
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c) C4H9OH
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d) C5H11OH
Explanation
Solubility of alcohols decreases with increasing molar mass because of increasing hydrophobic nature of alkyl group Answer : (d)
Q.12
Which of the following reactions gives an dialkyl oxonium salt?
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a) Ethyl alcohol + sodium metal
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b) Tertiary amine + alkyl halide
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c) Diethyl ether + hydrochloric acid
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d) Nitromethane + sodium metal
Explanation
Answer : (c)
Q.13
Glycerol is not used in ... ...
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a) cosmetics
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b) matches
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c) explosives
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d) soaps
Explanation
Answer : (b)
Q.14
Absolute alcohol is prepared from rectified spirit by ... ..
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a) fractional distillation
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b) steam distillation
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c) azeotropic distillation
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d) vacuum distillation
Explanation
Azeotropic distillation (AD) is a process to break azeotrope where another volatile component, called the entrainer, the solvent, or the mass separating agent (MSA), is added to form a new lower-boiling azeotrope that is heterogeneous. Alcohol forms a azeotropic mixture with water and absolute alcohol is obtained from this mixture ( rectified spirit) by adding benzene (entrainer) and then carrying out azeotropic distillation Answer : (c)
Q.15
Assertion: Solubility of n-alcohol in water decreases with increases in molar mass Reason:The hydrophobic nature of alkyl chain increases
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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.16
han One Correct Answer Q287) Which of the following statements about ether(s) is /are correct?
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a) Peroxide is obtained in the presence of air
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b) Ether are weakly acidic
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c) Ethers form oxonium salts
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d) Ethers form stable complexes with Lewis acids
Explanation
Answer : (a, c, d )
Q.17
Diacetone alcohol is obtained by the reaction of ... .....
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a) acetone and ethanol
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b) acetone and conc. H2SO4
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c) acetone and Ba(OH)2
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d) acetone and Al(OH) 3
Explanation
It is a aldol condensation Answer : (c)
Q.18
Oxygen atom of ether is .... ...
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a) active
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b) comparatively inert
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c) replaceable
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d) very active
Explanation
Ethers are relatively less active due to the absence of functional group Answer : (b)
Q.19
When ethyl alcohol vapours mixed with air, are pased over heated platinized asbestos, the compound formed is .... .....
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a) acetone
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b) acetaldehyde
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c) diethyl ether
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d) none of these
Explanation
Answer : (d)
Q.20
Ethyl propanoate on reduction with LiAlH yields ....
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a) methanol
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b) ethanol and propanol
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c) propane
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d) mixture of ethanol and methanol
Explanation
Answer : (b)
Q.21
han One Correct Answer Q292) Which is/are not soluble in water
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a) CS2
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b) C2H5OH
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c) CH3CHO
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d) CHCl3
Explanation
Answer : (a,d) ChCl3It is slightly soluble in water
Q.22
The correct order of the ease with primary, secondary and tertiary alcohols can be dehydrated using concentrated H2SO4 is .... .....
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a) primary > secondary > tertiary
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b) secondary > perimary > tertiary
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c) tertiary > secondary > primary
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d) secondary > tertiary > primary
Explanation
Reactivity of -OH group is due to +IE of alkyl group Answer : (c)
Q.23
The action of halogen acids on an ether, has the following order of reactivity
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a) HCl > HBr > HI
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b) HI > HCl > HBR
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c) HI > HBr > HCl
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d) HCl > HI > HBr
Explanation
Larger is H-X bond length, more acidic nature of halogen acid Answer : (c)
Q.24
Alcohol of low molar mass are ...
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a) Soluble in all solvents
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b) soluble in water on heating
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c) soluble in water
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d) insoluble in all solvent
Explanation
Solubility in water due to weaker hydrophobic character and strong H-boning Answer : (c)
Q.25
The boiling points of thio-ethers are .... than those of ether
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a) higher
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b) equal
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c) lesser
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d) none of these
Explanation
In thioether, sulphur substitute oxygen atom. Thus molecular weight increases compared to ether and boiling point of thioethers are higher than those of ether. Answer : (a)
Q.26
Which of the following is simple ether?
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a) C6H5OCH3
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b) CH3OCH3
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c) CH3OC2H5
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d) nPrOEt
Explanation
A simple ether is one which possesses same alkyl groups on O atom Answer : (b)
Q.27
Most viscous among the following is .... ...
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a) propan-1-ol
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b) propan-2-ol
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c) propane-1,2-diol
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d) propane-1,2,3-triol
Explanation
Answer : (d)
Q.28
Assertionp-dimethoxybenzene is polar Reason: The different orientation of methoxy group in ring results in to produce dipole
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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.29
on Q300) Following reaction is called as
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a) Claisen condensation
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b) Clemmensen condensation
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c) Fischer-Speier esterification
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d) none of the above
Explanation
Answer : (c)
Q.30
Reaction of tert-butyl bromide with sodium methoxide produces .... ...
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a) isobutane
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b) isobutylene
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c) sodium tert-butoxide
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d) tert-butyl methyl ether
Explanation
Williamson's synthesis for mixed ethers cannot be used to prepare ditertiary ethers, because tertiary alkyl halides on heating with sod.alkoxide gives dehydrohalogenation Answer : (b)
0 h : 0 m : 1 s
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