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NEET Chemistry MCQ
Alcohols, Phenols And Ethers Mcq Neet Chemistry
Quiz 8
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Q.1
Purity of ether before using it as anaesthetic agent is tested by ..... .....
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a) KI + starch
0%
b) CuSO4
0%
c) H2SO4
0%
d) none of these
Explanation
Peroxide ether has formed due to oxidation, the peroxide bonds will liberate I2 from KI which will give blue colour with starch. Answer : (a)
Q.2
On heating glycerol with conc. H2SO4, a compound is obtained which has bad odour. The compound is ... ....
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a) formic acid
0%
b) allyl alcohol
0%
c) methyl isocyanide
0%
d) acrolein
Explanation
Answer : (d)
Q.3
The most important ingredient of dynamite is ... ...
0%
a) glycerine trinitrate
0%
b) nitrobenzene
0%
c) nitrosobenzene
0%
d) nitrophenol
Explanation
Answer : (a)
Q.4
Methanol and ethanol can be distinguished by the following ... .....
0%
a) by heating with iodine and washing soda
0%
b) by reaction with caustic potash
0%
c) by reaction with metallic sodium
0%
d) by heating with zinc and inorganic mineral acid
Explanation
Ethanol gives iodoform test Answer : (a)
Q.5
Germinated barley ( an enzyme) is a source of enzyme
0%
a) invertase
0%
b) maltase
0%
c) zymase
0%
d) diastase
Explanation
Answer : (d)
Q.6
How many structural isomers are known for C4H10O?
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a) 3
0%
b) 4
0%
c) 6
0%
d) 7
Explanation
4 alcohol ( butan-1-ol; butan-2-ol; 2-methyl butan-1-ol; 2-methyl butan-2-ol) and 3 ether (diethyl ether, methyl-propyl ether and methyl isopropyl ether) Answer : (d)
Q.7
onMore Than One Correct Answers Q218) Which are the intermediate(s)
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer : (b,c)
Q.8
Which of the following is a gas?
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a) Propyl thiol
0%
b) Isobutyl thiol
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c) Methane thiol
0%
d) Ethane thiol
Explanation
CH3SH is gas with foul smell and thus, mixed with LPG to detect lis leakage Answer : (c)
Q.9
Which one of the following is not the characteristic of the alcohols?
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a) Their boiling points rise fairly uniformly with a rise in molar mass
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b) Lower members are insoluble in water and organic solvents but the solubility goes on increasing with the rise of molar mass
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c) These are lighter than water
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d) Lower members have a pleasant small but burning taste and the higher ones are odourless and tasteless
Explanation
Answer : (b)
Q.10
han One Correct Answer Q221) Which of the following statement is/are correct?
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a) When phenol vapour is passed over Zn dust, benzene is produced
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b) The phenolic -OH group is ortho- and para-directing
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c) o-nitrophenol has a lower b.p. than p-nitrophenol
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d) Phenol is more acidic than o-cresol
Explanation
Answer : (a,b,c,d)
Q.11
An organic compound A reacts with PCl5 to give B. The compound B with sodium metal gives n-butane. Thus A and B are .... ....
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a) C3H7OH and CH3CH2CH2OCl
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b) C2H5OH and C2H5Cl
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c) C2H5Cl and C2H5ONa
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d) C4H9OH and C4H9OCl
Explanation
Answer : (b)
Q.12
onMore Than One Correct Answers Q223) In the following reaction, the product(s) formed is (are)
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a) P(Major)
0%
b) Q(Minor)
0%
c) R(Minor)
0%
d) S(Major)
Explanation
Answer : (a, b, c)
Q.13
The dehydration of neo-phentanol gives mainly .... .....
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a)
0%
b)
0%
c) CH3 - CH2 - CH = CH2
0%
d) none of the above
Explanation
Answer : (b)
Q.14
Which reagent is more effective to convert but-2-enal to but-2-enol?
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a) K2Cr2O7/H2SO4
0%
b) H2/Pt
0%
c) KMnO4
0%
d) NaBH4
Explanation
NaBH4 , LiAlH4 has no effect on C=C Answer : (d)
Q.15
The products formed in the following reaction in presence of heat is .... .... C6H5OCH3 + HI ......
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a) C6H5I and CH3OH
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b) C6H6 and CH3OI
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c) C6H5OH and CH3I
0%
d) C6H5CH3 and HOI
Explanation
C6H5OCH3 + HI → C6H5OH + CH3I Phenol shows stabilization due to resonance Answer : (c)
Q.16
The IUPAC name of CH3COH(CH3)2 is .... ......
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a) 3-methoxy propane
0%
b) 2-methoxy propane
0%
c) methyl-isopropylether
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d) 1-methoxy propane
Explanation
Answer : (b)
Q.17
The value of C - O - C angle in ether molecule is ... ...
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a) 90°
0%
b) 110°
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c) 150°
0%
d) 180°
Explanation
Bond angle is 110° due to steric hindrance of bulky alkyl groups Answer : (b)
Q.18
Which of the following is an alkoxide?
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a) CH2OH . CH2OH
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b) CH3CH2CH2CH2ONa
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c)
0%
d)
Explanation
Alkoxide has metal-oxygen bond Answer : (b)
Q.19
Which of the following is an anaesthetic?
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a) Trichloromethane
0%
b) Thiobarburates
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c) Ether
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d) All of the above
Explanation
Answer : (a)
Q.20
An aqueous solution of ethyl alcohol .... ....
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a) turns blue litmus red
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b) turns red litmus blue
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c) does not affect the litmus colour
0%
d) decolourises litmus
Explanation
Alcohols are neutral and do not influence pH Answer : (c)
Q.21
Molasses contains .... ....
0%
a) 10% sugar
0%
b) 50% sugar
0%
c) 60% sugar
0%
d) 70% sugar
Explanation
Molasses, the brown syrupy liquid left after crystallization contains about 50% sugar Answer : (b)
Q.22
Oxidation of allyl alcohol, (CH2 = CH - CH2OH) gives a mixture of oxalic acid and formic acid. If this oxidation is done in presence of bromine. One would expect only .... ....
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a) acrylic acid
0%
b) formic acid
0%
c) oxalic acid
0%
d) succinic acid
Explanation
Only CH2OH group is oxidized to -COOH; double bond is not affected Answer : (a)
Q.23
(CH3CO)Na on reaction with CH3Br will give ... ..
0%
a) CH3OCH3
0%
b) (CH3)3COCH3
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c) (CH3)3COC(CH3)3
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d) CH3CH2OCH2CH3
Explanation
Answer : (b)
Q.24
Which method 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) Dehydration
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d) Rearrangement
Explanation
Answer : (b)
Q.25
on Q235) In the reaction below find product X is
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a)
0%
b)
0%
c)
0%
d)
Explanation
It is catalysed cleavage of cyclic ether where nucleophile attack least carbon Answer : (d)
Q.26
From methyl alcohol we get .... ....
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a) neoprene rubber
0%
b) perspex rubber
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c) backelite a hard plastic
0%
d) sponge rubber
Explanation
Perspex rubber is polymethyl methyl acrylate (PMMA) is obtained by methyl methyl acrylate. Answer : (b)
Q.27
3-methyl-2-butanol on treatment with HCl gives predominantly ... ...
0%
a) 2-chloro-3-methylbutane
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b) 2,2- dimethylpentane
0%
c) 2-chloro-2methylbutane
0%
d) 2-chlro-pentane
Explanation
Stable tertiary carbon atom as intermediate if formed Answer : (c)
Q.28
han One Correct Answer Q238) Denatured spirit is used as
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a) fuel
0%
b) beverage
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c) solvent
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d) none of these
Explanation
Answer : (a and c )
Q.29
Fenton's reagent is .... ......
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a) H2O2 + FeSO4
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b) H2O2 + ZnSO4
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c) H2O + FeSO4
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d) NaOH + FeSO4
Explanation
Answer : (a)
Q.30
When CH3MgI is made to react with acetone and the addition product formed in hydrolysed, we get .... ..
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a) secondary alcohol
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b) an aldehyde
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c) a tertiary alcohol
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d) a primary alcohol
Explanation
Answer : (c)
0 h : 0 m : 1 s
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