MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
NEET
NEET Chemistry MCQ
Alcohols, Phenols And Ethers Mcq Neet Chemistry
Quiz 11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Q.1
The toxicity order for CH3OH, C2H5OH and C3H7OH is ... ...
0%
a) C2H5OH < CH3OH < C3H7OH
0%
b) C3H7OH < C2H5OH < CH3OH
0%
c) C2H5OH < C3H7OH < CH3OH
0%
d) CH3OH < CH3OH < C3H7OH
Explanation
Answer : (c)
Q.2
The compound which does not react with sodium is
0%
a) CH3- O - CH3
0%
b) C2H5OH
0%
c) CH3CHOHCH3
0%
d) CH3COOH
Explanation
Ether do not contain acidic H-atom Answer : (a)
Q.3
When acetyl chloride is reduced with LiAlH4, the product formed is ... ......
0%
a) acetaldehyde
0%
b) acetone
0%
c) methyl alcohol
0%
d) ethyl alcohol
Explanation
Answer : (d)
Q.4
Association of alcohol molecules takes place because of .... ....
0%
a) ionic bond
0%
b) hydrogen bond
0%
c) electrovalent bond
0%
d) covalent bond
Explanation
Answer : (b)
Q.5
On reduction with LiAlH4, a ketone yields .... ....
0%
a) primary alcohol
0%
b) secondary alcohol
0%
c) tertiary alcohol
0%
d) all of these
Explanation
Answer : (b)
Q.6
23g of sodium reacts with CH3OH to give ..... .....
0%
a) 1 mole of O2
0%
b) ½ mole of H2
0%
c) 1 mole of H2
0%
d) none of these
Explanation
Answer : (b)
Q.7
Glycol reacts with PCl3 and gives ethylene dichloride. What will be the product, if it reacts with P+I2
0%
a) Ethylene
0%
b) Ethylene iodide
0%
c) Ethylene iodohydrin
0%
d) None of these
Explanation
OHCH2CH2OH + PI3 → [CH2I-ICH2] -> CH2=CH2 + I2 Answer : (a)
Q.8
The reaction given below is called C2H5OH + SOCl2 → C2H5Cl + SO2 + HCl
0%
a) Hunsdicker's reaction
0%
b) Wurts reaction
0%
c) Karasch effect
0%
d) Darzen's reaction
Explanation
Answer : (d)
Q.9
on Q310) Identify (X) in the reaction ... ..
0%
a) CH3 - CH2 - CH2OH
0%
b) CH3 - O- CH3
0%
c) C2H5CHO
0%
d) CH3COOH
Explanation
K2Cr2O7+ 3C2H8O + 4H2SO4 = Cr2(SO4)3 + K2SO4 + 7H2O + 3CH3COCH3 (CH3)2C=O + I + NaOH → CH3COOH + CHI3 Answer : (d)
Q.10
The major organic product in the reaction CH3 - O - CH(CH3)2 + HI → product is
0%
a) CH3OC(CH3)2
0%
b) CH3I + (CH3)2CHOH
0%
c) CH3OH + (CH3)2CHI
0%
d) ICH2PCH(CH3)2
Explanation
CH3 - O - CH(CH3)2 + HI → CH3I + (CH3)2CH2OH Halogen goes with simpler alkyl group Alkyl ethers are cleaved by the strong acids HI or HBr in a nucleophilic substitution reaction similar to that of alcohols. Protonation of the ethereal oxygen creates a good leaving group, a neutral alcohol molecule. The halide ion, bromide or iodide are both good nucleophiles. Depending on the structure of the alkyl groups, the reaction can be SN1 or SN2 like. Answer : (b)
Q.11
Dialkyl sulphide are known as .... ...
0%
a) mercaptan
0%
b) thioester
0%
c) sulphonal
0%
d) thioethers
Explanation
R - S - R or R - SR' are thioethers Answer : (d)
Q.12
Scientific aspect of fermentation was first studied by ... ..
0%
a) Pasteur
0%
b) Bose
0%
c) Buchner
0%
d) Liebig
Explanation
Answer : (c)
Q.13
On boiling with concentrated hydrobromic acid phenyl ethyl ether yields
0%
a) phenol and ethane
0%
b) bromobenzene and ethanol
0%
c) bromobenzene and ethane
0%
d) phenol and ethyl bromide
Explanation
C6H5OC2H5 + HBr → C6H5OH + C2H5Br Answer : (d)
Q.14
Assertion: C2H5I is more reactive than C2H5Cl Reason: I is less electronegative than Cl
0%
a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
0%
b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
0%
c) Assertion is true but, Reason is false
0%
d) Assertion is false but, Reason is true
Explanation
Answer : (b)
Q.15
Which of the following undergoes dehydration most readily?
0%
a) 1-phenyl-1-butanol
0%
b) 1-phenyl-2-butanol
0%
c) 2-phenyl-2-butanol
0%
d) 2-phenyl-1-butanol
Explanation
Tertiary alcohols are easily dehydrated Answer : (c)
Q.16
han One Correct Answer Q317) The general formula(s) of monohydric alcohol is/are
0%
a) CnH2nO
0%
b) CnH2n+1OH
0%
c) CnH2n+2O
0%
d) CnH2n+4O
Explanation
Answer : (b and c )
Q.17
Glycerol catches fire on mixing with .... ....
0%
a) KMnO4
0%
b) K2Cr2O7
0%
c) HNO3
0%
d) none of these
Explanation
Potassium permanganate is a strong oxidizing agent and glycerol is an easily oxidized substance. An exothermic reaction occurs after a time delay that can be 2 – 3 minutes with the glycerol giving off smoke and eventually producing a coloured flame that spreads around the pile of potassium permanganate. 14KMnO4 + 4C3H5(OH)3 → 7K2CO3 + 7Mn2O3 +5CO2 +16H2O Answer : (a)
Q.18
In the reaction, the products formed are (CH3)2CH2.CH2.O.CH2CH3 + HI →
0%
a) (CH3)2CH.CH2 + CH3CH2OH
0%
b) (CH3)2CHCH2OH + C2H5I
0%
c) (CH3)2CH.CH2I + CH3CH2OH
0%
d) (CH3)2 CH.CH2OH + C2H6
Explanation
I- attacks on lower alkyl group due to stearic hindrance on larger group Answer : (b)
Q.19
During alcoholic fermentation inorganic slats like ammonium sulphate or ammonium phosphate are added ....
0%
a) which produce desirable enzymes
0%
b) Which act as food for ferment cells
0%
c) to decrease the freezing point of solution
0%
d) which prevents the growth of undesirable bacteria
Explanation
Answer : (b)
Q.20
HOH2C.CH2OH on heating with periodic acid gives
0%
a) 2 HCHO
0%
b) 2CO2
0%
c) 2HCOOH
0%
d) HCHO
Explanation
HIO4 oxidises - CH2OH to HCHO and breaks the C-C bond of terminal CH2OH groups Answer : (a)
Q.21
The -OH group of methyl alcohol cannot be replaced by chlorine by the action of ... ....
0%
a) HCl
0%
b) PCl3
0%
c) PCl5
0%
d) Chlorine
Explanation
dry Cl2 has no action over CH3OH. In presence of moisture it oxidizes CH3OH to HCHO Answer : (d)
Q.22
The boiling point of ethyl alcohol is much higher than that of dimethyl ether and C2H5SH, though both have same molar mass. the reason for this si ... ...
0%
a) ethyl alcohol shows hydrogen bonding
0%
b) dipole moment of ethyl alcohol is less
0%
c) methyl groups are attached to oxygen in ether
0%
d) ether is insoluble in water
Explanation
Answer : (a)
Q.23
The prospective fuel 'gashol' is a mixture of ... ....
0%
a) radioactive substances
0%
b) petrol and ethanol
0%
c) petrol and phenol
0%
d) gaseous hydrocarbons and heavy water
Explanation
Answer : (b)
Q.24
In CH3CH2OH the bond which most readily undergoes heterolytic cleavage during its reaction with CH3COOH/H2SO4 is ....
0%
a) C - C
0%
b) C - O
0%
c) O- H
0%
d) C - H
Explanation
O-H undergoes heterolytic cleavage because the oxygen is directly attached to the carbon while the hydrogen (of the OH bond). The average bond enthalpy between C-O is way greater than the bond enthalpy of O-H. Answer : (c)
Q.25
Diethyl ether absorbs oxygen to form .... .....
0%
a) ether peroxide
0%
b) acetic acid
0%
c) red coloured sweet smelling compound
0%
d) ether suboxide
Explanation
Answer : (a)
Q.26
To obtain unsaturated alcohol from unsaturated aldehydes the following reagent is used for reduction
0%
a) Na amalgam/H2O
0%
b) Dil.H2SO4
0%
c) LiAH4
0%
d) Zn/HCl
Explanation
Answer : (c)
Q.27
Structure of diethyl ether can be confirmed by .... ...
0%
a) Kolbe's synthesis
0%
b) Williomson's synthesis
0%
c) Wurtz's synthesis
0%
d) Frankland's synthesis
Explanation
C2H5ONa + C2H5X → C2H5OC2H5 Answer : (b)
Q.28
han One Correct Answer Q329) Which of the following compounds is/are easily oxidised by K2Cr2O7 and H2SO4?
0%
a) CH3CH2OH
0%
b) (CH3)2CHOH
0%
c) CH3CHO
0%
d) (CH3)3COH
Explanation
Answer : ( a, b and c)
Q.29
f methanol vapour is passed over heated copper at 300°C
0%
a) dehydration
0%
b) oxidation
0%
c) hydrogenation
0%
d) dehydrogenation
Explanation
CH3OH → HCHO + H2 Answer : (d)
Q.30
A compound with molecular formula C4H10O3 is converted by the action of acetyl chloride to a compound with molar massThe original compound has ... ...
0%
a) one OH group
0%
b) two OH groups
0%
c) three OH groups
0%
d) no OH group
Explanation
Molar mass of C4H10O3 = 106, on reaction with CH3COCl; H-atom of OH group is replaced by OCH3 group and thus showing and increase in molar mass by 42 unit. Thus, if molar mass becomes 190, it means molecule has two -OH group Answer : (b)
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page