Question 1

In the dichlorination reaction of propane, mixture of products are obtained. How many isomers, the mixture contains&#8230;&#8230;&#8230;&#8230;&#10;A)2&#10;B)3&#10;C)4&#10;D)5

Accepted Answer

The dichlorination of propane can lead to four different isomers: 1,1-dichloropropane, 1,2-dichloropropane, 1,3-dichloropropane, and 2,2-dichloropropane.

Question 2

Which of the following cycloalkane gives open chain compound, when reacts with bromine&#8230;&#8230;&#8230;..&#10;A)Cyclopropane&#10;B)Cyclopentane&#10;C)Cyclohexane&#10;D)Cyclo-octane

Accepted Answer

Cyclopropane reacts with bromine to give an open chain compound due to the ring strain in cyclopropane, which makes it more reactive and prone to ring opening reactions.

Question 3

Grignard reagent is not prepared in aqueous medium but prepared; in ether medium because the reagent&#8230;&#8230;&#8230;&#8230;..&#10;A)Reacts with water&#10;B)Is insoluble in water&#10;C)Is highly reactive in ether&#10;D)Becomes inactive in water

Accepted Answer

Grignard reagents react with water, which would destroy the reagent, so they are prepared in an ether medium to prevent this reaction.

Question 4

A sample of petrol is a mixture of 30% n-heptane and 70% iso-octane. The sample has octane number&#8230;&#8230;&#8230;&#8230;&#10;A)30&#10;B)70&#10;C)15&#10;D)35

Accepted Answer

The octane number of a fuel is a measure of its resistance to knocking or pinging during combustion, typically in a spark-ignition internal combustion engine. n-Heptane has an octane number of 0, indicating it knocks easily, while iso-octane has an octane number of 100, indicating high resistance to knocking. The sample's octane number is calculated based on the percentage of each component and their respective octane numbers. Thus, for a mixture of 30% n-heptane (octane number = 0) and 70% iso-octane (octane number = 100), the octane number is (0.30*0) + (0.70*100) = 70.

Question 5

Photochemical chlorination of alkane is initiated by a process of&#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Pyrolysis&#10;B)Substitution&#10;C)Cracking&#10;D)Homolysis

Accepted Answer

Photochemical chlorination of alkane is initiated by homolysis, where the chlorine molecule absorbs light and splits into two chlorine radicals, starting the chain reaction of substitution.

Question 6

A petroleum fraction having boiling range 70-200&#176;C and containing 6-10 carbon atoms per molecule is called&#8230;&#8230;&#8230;..&#10;A)Natural gas&#10;B)Gas oil&#10;C)Gasoline&#10;D)Kerosene

Accepted Answer

Gasoline is the petroleum fraction that typically has a boiling range of about 70-200°C and contains molecules with 6 to 10 carbon atoms, making it suitable for use as a fuel in internal combustion engines.

Question 7

Pick out the alkane which differs from the other members of the group.&#10;A)2,2-dimethyl propane&#10;B)Pentane&#10;C)2-methyl butane&#10;D)2,2-dimethyl butane

Accepted Answer

2,2-dimethyl butane is the only alkane with a different number of carbon atoms (6) compared to the others, which all have 5 carbon atoms.

Question 8

2-Methylbutane on reacting with bromine in the presence of sunlight gives mainly&#8230;&#8230;..&#10;A)1-bromo-2-methylbutane&#10;B)2-bromo-2-methylbutane&#10;C)2-bromo-3-methylbutane&#10;D)1-bromo-3-methylbutane

Accepted Answer

In the presence of sunlight, bromination of alkanes occurs via a radical halogenation mechanism. 2-Methylbutane will primarily form 2-bromo-2-methylbutane because the tertiary hydrogen (the one on the carbon bonded to three other carbons) is the most susceptible to radical substitution, leading to the most stable tertiary radical intermediate.

Question 9

Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is&#8230;&#8230;&#8230;&#8230;..&#10;A)n-hexane&#10;B)2, 3-dimethylbutane&#10;C)2, 2-dimethylbutane&#10;D)2-methylpentane

Accepted Answer

2,3-dimethylbutane has two types of hydrogen atoms that can be replaced by chlorine, leading to two different monochlorinated products.

Question 10

Which group is present on alcohol. A)OH B)C=O C)CHO D)NO₂

Accepted Answer

The OH (hydroxyl) group is present on alcohols, characterizing them by the presence of one or more hydroxyl groups attached to a carbon atom.

Question 11

Which suffix attached in alcohol.&#10;A)En&#10;B)Ol&#10;C)Ene&#10;D)Hyde

Accepted Answer

The answer of Which suffix attached in alcohol.&#10;A)En&#10;B)Ol&#10;C)Ene&#10;D)Hyde...

Question 12

Butane-2-ol is &#8230;&#8230;.&#10;A)Primary alcohol&#10;B)Secondary alcohol&#10;C)Tertiary alcohol&#10;D)Aldehyde

Accepted Answer

The answer of Butane-2-ol is &#8230;&#8230;.&#10;A)Primary alcohol&#10;B)Secondary alcohol&#10;C)Tertiary alcohol&#10;D)Aldehyde...

Question 13

Pentanol is a&#8230;&#8230;..&#10;A)Primary alcohol&#10;B)Secondary alcohol&#10;C)Tertiary alcohol&#10;D)None of these

Accepted Answer

The answer of Pentanol is a&#8230;&#8230;..&#10;A)Primary alcohol&#10;B)Secondary alcohol&#10;C)Tertiary alcohol&#10;D)None of...

Question 14

Glycerol is a&#8230;&#8230;&#10;A)Primary alcohol&#10;B)Monohydric alcohol&#10;C)Secondary alcohol&#10;D)Trihydric alcohol

Accepted Answer

The answer of Glycerol is a&#8230;&#8230;&#10;A)Primary alcohol&#10;B)Monohydric alcohol&#10;C)Secondary alcohol&#10;D)Trihydric alcohol...

Question 15

Which is primary alcohol&#8230;&#8230;.&#10;A)Butane-2-ol&#10;B)Butane-1-ol&#10;C)Propane-2-ol&#10;D)Isopropyl alcohol

Accepted Answer

The answer of Which is primary alcohol&#8230;&#8230;.&#10;A)Butane-2-ol&#10;B)Butane-1-ol&#10;C)Propane-2-ol&#10;D)Isopropyl alcohol...

Question 16

General formula of primary alcohol is ……. A)CHOH B)COH C)CH₂OH D)COHOH

Accepted Answer

The answer of General formula of primary alcohol is ……. A)CHOH B)COH C)CH₂OH D)COHOH...

Question 17

The characteristic grouping of secondary alcohols is……. A)CHOH B)COH C)CH₂OH D)COHOH

Accepted Answer

The answer of The characteristic grouping of secondary alcohols is……. A)CHOH B)COH C)CH₂OH D)COHOH...

Question 18

Which of the following are isomers&#8230;&#8230;.&#10;A)Methyl alcohol and dimethyl ether&#10;B)Ethyl alcohol and dimethyl ether&#10;C)Acetone and acetaldehyde&#10;D)Propionic acid and propanone

Accepted Answer

The answer of Which of the following are isomers&#8230;&#8230;.&#10;A)Methyl alcohol...

Question 19

The compound HOH₂C - CH₂OH is……. A)Ethane glycol B)Ethylene glycol C)Ethylidene alcohol D)Dimethyl alcohol

Accepted Answer

The answer of The compound HOH₂C - CH₂OH is……. A)Ethane glycol B)Ethylene...

Question 20

Methylated spirit is&#8230;&#8230;..&#10;A)Methanol&#10;B)Methanol + ethanol&#10;C)Methanoic acid&#10;D)Methanamide

Accepted Answer

The answer of Methylated spirit is&#8230;&#8230;..&#10;A)Methanol&#10;B)Methanol + ethanol&#10;C)Methanoic acid&#10;D)Methanamide...

Question 21

Absolute alcohol is……. A)100% pure ethanol B)95% alcohol + 5% H₂O C)Ethanol + water + phenol D)95% ethanol + 5% methanol.

Accepted Answer

The answer of Absolute alcohol is&#8230;&#8230;.&#10;A)100% pure ethanol&#10;B)95% alcohol +...

Question 22

Which of the following is dihydric alcohol &#8230;&#8230;.&#10;A)Glycerol&#10;B)Ethylene glycol&#10;C)Catechol&#10;D)Resorcinol

Accepted Answer

The answer of Which of the following is dihydric alcohol...

Question 23

Wood spirit is known as &#8230;&#8230;&#8230;&#10;A)Methanol&#10;B)Ethanol&#10;C)Acetone&#10;D)Benzene

Accepted Answer

The answer of Wood spirit is known as &#8230;&#8230;&#8230;&#10;A)Methanol&#10;B)Ethanol&#10;C)Acetone&#10;D)Benzene...

Question 24

Which one of the following will produce a primary alcohol by reacting with CH₃MgI…….. A)Acetone B)Methyl cyanide C)Ethylene oxide D)Ethyl acetate

Accepted Answer

The answer of Which one of the following will produce...

Question 25

The fermentation of starch to give alcohol occurs mainly with the help of ……… A)O₂ B)Air C)CO₂ D)Enzymes

Accepted Answer

The answer of The fermentation of starch to give alcohol...

Deck 5: Alkanes and Alcohols