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WorksheetsMCQ-Organic-I
Total questions: 75
Worksheet time: 38mins
Name
Class
Date
1.
Saturated hydrocarbons are otherwise referred as ________________
a)
Alkanes
b)
Alkenes
c)
Alkynes
d)
Alkaloids
2.
Identify the correct alkane name for the molecular formula C30H62
a)
Propdecane
b)
Eicosane
c)
Triacontane
d)
Dodecane
3.
Identify the smallest alkane which can form a ring structure (cycloalkane)?
a)
Cyclomethane
b)
Methane
c)
Cyclopropane
d)
Propane
4.
The first step in IUPAC nomenclature is to identify the total number of carbon atoms present in the compound.
a)
True
b)
False
c)
Both
d)
None
5.
The substituent in the chain is named by replacing the “ane” in the alkanes by _________
a)
ene
b)
ic
c)
one
d)
yl
6.
Dienes are the name given to compounds with
a)
Exactly a double bond
b)
Exactly a triple bond
c)
Exactly two double bond
d)
More than two double bond
7.
Triple bond with two carbon atoms on either side is called
a)
Methnyl group
b)
Ethynyl group
c)
Propionyl group
d)
Propargyl group
8.
The substituent groups that are commonly associated with benzene ring are
a)
Phenyl and benzyl
b)
Propyl and phenyl
c)
Methyl and benzyl
d)
Butyl and phenyl
9.
In Alkenes the Carbon atoms are connected to each other by a
a)
Single bond
b)
Double bond
c)
Triple bond
d)
Not connected
10.
Which among these is not a structural isomer of the compound C4H8?
a)
But-1-ene
b)
But-2-ene
c)
But-3-ene
d)
2-methylpropene
11.
Select the incorrect statement regarding alkenes.
a)
In alkenes, the carbons are connected by pi bonds
b)
Alkenes undergo polymerization reaction
c)
Alkenes have almost same physical properties as that of the alkanes
d)
Alkenes are less reactive than alkanes
12.
Identify the incorrect statement regarding the synthesis of alkenes.
a)
Cracking of a hydrocarbon yields alkenes
b)
The reactions are exothermic
c)
Zeolite catalyst helps in the synthesis of alkenes
d)
The synthesis of alkenes is otherwise known as reforming
13.
Identify the one which shows E-Z mechanism?
a)
3-methylpent-2-ene
b)
2-methylpent-2-ene
c)
Methyl-3-pent-2-ene
d)
2,3-methylpentene
14.
Which among the following is not colourless
a)
Methene
b)
Ethene
c)
Propene
d)
Butene
15.
Which among the following alkenes is used in the manufacturing of plastics
a)
Butadiene
b)
1,2-butadiene
c)
1,3-butadiene
d)
2-butadiene
16.
4-chlorobut-1-ene is the name of which among the following alkenes
a)
CH2Cl-CH2=CH-CH2
b)
CH2Cl-CH2-CH-CH2
c)
CH2Cl=CH2-CH=CH2
d)
CH2Cl-CH2-CH=CH2
17.
Select the incorrect statement regarding alkanes.
a)
It is otherwise known as Paraffin
b)
It is an acyclic saturated hydrocarbon
c)
In alkanes, C-C bonds are single
d)
Alkanes have the general formula CnH2n
18.
Identify the simplest alkane.
a)
Methane
b)
Methene
c)
Ethane
d)
Ethene
19.
Select the minimum number of carbon atoms, a molecule must possess so as to be regarded as a higher alkane.
a)
15
b)
16
c)
17
d)
18
20.
Identify the incorrect statement.
a)
Alkanes with repeated –CH2– units constitute a homologus series
b)
They are very reactive
c)
They have very less biological activity
d)
Petroleum and natural gas are the main sources of alkanes
21.
The other name for branched chain alkanes is _____________
a)
Paraffins
b)
Isoparaffins
c)
Neoparaffins
d)
Naphthenes
22.
Select the incorrect statement regarding the boiling points of alkanes.
a)
Boiling point increases with stronger Vander Waal’s forces
b)
Surface area is the only factor which determines the boiling point of alkane
c)
Boiling point of straight chain alkanes is greater than that of branched chain alkanes
d)
The boiling point of cycloalkanes is always higher than that of linear alkanes
23.
Choose the correct statement.
a)
Alkanes have poor conductivity
b)
They form hydrogen bonds
c)
They have good solubility in non polar solvents than polar solvents
d)
Alkanes have less density than that of water
24.
Liquified petroleum gas is mainly composed of _____________
a)
Methane and ethane
b)
Ethane and propane
c)
Propane and butane
d)
Butane and hexane
25.
An alkane with 6 carbon atoms will have how many hydrogen atoms?
a)
11
b)
12
c)
13
d)
14
26.
What is the general formula for an aliphatic alcohol? (R=alkyl group)
a)
R-H
b)
R-OH
c)
R-CHO
d)
R-COOH
27.
Which of the following is true regarding polyhydric alcohols
a)
It should have one or more OH groups
b)
It should have two or more OH groups
c)
It should have three or more OH groups
d)
It should have more than four OH groups
28.
Which of the following types of alcohol contain a bond between sp2 hybridised carbon and OH group?
a)
Primary allylic alcohols
b)
Secondary allylic alcohols
c)
Tertiary allylic alcohols
d)
Vinylic alcohols
29.
Which of the following terms does not describe CH2=CH-CH2OH?
a)
Primary
b)
Monohydric
c)
Allylic
d)
Vinylic
30.
Primary alcohols van be benzylic in nature.
a)
True
b)
False
c)
Both
d)
None
31.
Which of the following is not a vinylic alcohol?
a)
CH2=CH-OH
b)
HO-CH=CH-CH3
c)
CH2=CH-CH2-OH
d)
CH3-CH2-CH=CH-OH
32.
R-O-R, where R represent an alkyl or aryl group is the general formula of which compound?
a)
Ether
b)
Ester
c)
Aldehyde
d)
Ketone
33.
Which of the following is given highest preference while naming when present in the same structure?
a)
Hydroxyl group
b)
Nitro group
c)
Triple bond
d)
Halogen group
34.
Which suffix attached in alcohol.
a)
En
b)
Ol
c)
Ene
d)
Hyde
35.
Butane-2-ol is …….
a)
Primary alcohol
b)
Secondary alcohol
c)
Tertiary alcohol
d)
Aldehyde
36.
General formula of primary alcohol is …….
a)
CHOH
b)
COH
c)
CH2OH
d)
COHOH
37.
Methylated spirit is……..
a)
Methanol
b)
Methanol + ethanol
c)
Methanoic acid
d)
Methanamide
38.
Primary alcohols can be obtained from the reaction of the RMgX……
a)
CO2
b)
HCHO
c)
CH3 CHO
d)
H2O
39.
If the boiling point of propanol is 370 K, predict the boiling point of acetic acid.
a)
322 K
b)
329 K
c)
370 K
d)
390 K
40.
Boiling point of aromatic carboxylic acids are higher than that of comparable aliphatic carboxylic acids.
a)
True
b)
False
c)
Both
d)
None
41.
Identify the most suitable reagent for the conversion of ethanal to acetic acid.
a)
Alkaline KMnO4; H3O+
b)
Jones reagent
c)
Tollen’s reagent
d)
LiAlH4
42.
What is formed when metal salt of an acid is heated with an alkyl halide?
a)
Alcohol
b)
Alkyl ester
c)
Aromatic
d)
None of the mentioned
43.
Acetic acid is obtained when which of the given reaction takes place?
a)
Methyl alcohol is oxidised with potassium permanganate
b)
Calcium acetate is distilled in the presence of calcium formate
c)
Acetaldehyde is oxidised with potassium dichromate and sulphuric acid
d)
Glycerol is heated with sulphuric acid
44.
Acetic acid is manufactured by the fermentation of which of the following reaction?
a)
Ethanol
b)
Methanol
c)
Ethanal
d)
Methanal
45.
When CH3COOH reacts with CH3−Mg−X, which of the following is formed?
a)
CH3COX is formed
b)
Hydrocarbon is formed
c)
Acetone is formed
d)
Alcohol is formed
46.
Aliphatic compound is the other name for _________
a)
Acyclic compounds
b)
Alicyclic compounds
c)
Ring compounds
d)
Closed chain compounds
47.
Organic compounds are broadly classified as _________
a)
Open chain compounds and acyclic compounds
b)
Open chain compounds and linear chain compounds
c)
Cyclic compounds and alicyclic compounds
d)
alicyclic compounds and acyclic compounds
48.
Which among the following is not an example of Acyclic compound?
a)
Acetaldehyde
b)
Ethane
c)
Cyclopropane
d)
Isobutane
49.
Which among these is not associated with aliphatic compounds?
a)
They contain (4n+2)pi electrons
b)
Contain straight chain compounds
c)
Contain branched chain compounds
d)
Has appropriate number of H-atoms and functional groups
50.
The decreasing order of boiling points is ……….
a)
n-Pentane > iso-Pentane > neo-Pentane
b)
iso-Pentane > n-Pentane > neo-Pentane
c)
neo-Pentane > iso-Pentane > n-Pentane
d)
n-Pentane > neo-Pentane > iso-Pentane
51.
In the preparation of Grignard reagent from haloalkane, the metal
a)
Mg
b)
Zn
c)
Li
d)
K
52.
Which of the following is not formed by the reaction of Cl2 on CH4 in sunlight……….
a)
CHCl3
b)
CH3Cl
c)
CH3CH3
d)
CH3CH2CH3
53.
A reaction between methyl magnesium bromide and ethyl alcohol gives……….
a)
Methane
b)
Ethane
c)
Propane
d)
Butane
54.
Paraffin wax is……….
a)
Ester
b)
Alcohol
c)
Unsaturated hydrocarbon
d)
Saturated Hydrocrabon
55.
Petroleum consists mainly of…………
a)
Aromatic hydrocarbons
b)
Aliphatic hydrocarbons
c)
Aliphatic alcohols
d)
None of these
56.
In alkanes, the bond angle is……..
a)
120 o
b)
109 o
c)
109.5 o
d)
180 o
57.
Halogenation of alkanes is an example of………..
a)
Electrophilic substitution
b)
Nucleophilic substitution
c)
Free-radical substitution
d)
Oxidation
58.
Carbon black, which is used in making printer's ink, is obtained by decomposition of………….
a)
Acetylene
b)
Benzene
c)
Carbon tetrachloride
d)
Methane
59.
Which statement is not true concerning alkanes………..
a)
Large number alkanes are soluble in water
b)
All alkanes have a lower density than water
c)
At room temperature some alkanes are liquids, some solids and some gases
d)
All alkanes burn
60.
Which of the following has highest percentage of hydrogen………..
a)
CH4
b)
C2H4
c)
C6H6
d)
C2H2
61.
The final product of complete oxidation of hydrocarbons is ………..
a)
Acid
b)
Aldehyde
c)
H2O + CO2
d)
Dihydric alcohol
62.
Which of the following will have least hindered rotation about carbon-carbon bond…………
a)
Hexachloroethane
b)
Acetylene
c)
Ethylene
d)
Ethane
63.
Which one of the following compounds does not give addition reactions………………
a)
Aldehydes
b)
Alkanes
c)
Alkenes
d)
Alkenes
64.
Isomerism in saturated hydrocarbons is due to…………..
a)
Change in the valence of carbon
b)
Change in the ratio of elements in compounds
c)
Formation of branches in the chain of C atoms
d)
Formation of double bond
65.
Which of the following is not linked with methane…………
a)
Marsh gas
b)
Natural gas
c)
Producer gas
d)
Coal gas
66.
Most of the hydrocarbons from petroleum are obtained by…………….
a)
Fractional crystallization
b)
Vaporization
c)
Polymerization
d)
Fractional distillation
67.
Photochemical chlorination of alkane is initiated by a process of……………
a)
Pyrolysis
b)
Substitution
c)
Cracking
d)
Homolysis
68.
Which group is present on alcohol.
a)
C=O
b)
NO2
c)
OH
d)
CHO
69.
What is the correct common name for CH3OC2H5
a)
Methyl methyl ether
b)
Methyl ethyl ether
c)
Ethyl ethyl ether
d)
Ethyl methyl ether
70.
Which of the following compounds is ethoxyethane?
a)
CH3OCH3
b)
CH3OC2H5
c)
C2H5OC2H5
d)
C2H5OC3H7
71.
Which of the following aliphatic carboxylic acids is a solid at room temperature?
a)
Heptanoic acid
b)
Octanoic acid
c)
Nonanoic acid
d)
Decanoic acid
72.
The solubility of carboxylic acids _________ with the increase in size of alkyl groups.
a)
increases
b)
decreases
c)
remains same
d)
varies unpredictably
73.
What is the correct order of boiling points of the following?
a)
HCOOH > CH3COOH > C2H5COOH
b)
C2H5COOH > CH3COOH > HCOOH
c)
HCOOH > C2H5COOH > CH3COOH
d)
CH3COOH > HCOOH > C2H5COOH
74.
Boiling point of alcohol is comparatively higher than that corresponding alkane due to…….
a)
Intermolecular hydrogen bonding
b)
Intramolecular hydrogen bonding
c)
Volatile nature
d)
None of these
75.
kerosene is used as fuel because
a)
Less volatile
b)
More volatile
c)
Cheap
d)
abundently available
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