Question 1

Which represents an alkane……… A)C₅H₈ B)C₆H₈ C)C₉H₁₀ D)C₇H₁₆

Accepted Answer

Alkanes are saturated hydrocarbons with the general formula CnH2n+2. C7H16 fits this formula, indicating it is an alkane.

Question 2

The decreasing order of boiling points is &#8230;&#8230;&#8230;.&#10;A)n-Pentane > iso-Pentane > neo-Pentane&#10;B)iso-Pentane > n-Pentane > neo-Pentane&#10;C)neo-Pentane > iso-Pentane > n-Pentane&#10;D)n-Pentane > neo-Pentane > iso-Pentane

Accepted Answer

The boiling point of a compound is influenced by its molecular structure. n-Pentane has the highest boiling point because it has the longest chain, providing a larger surface area for van der Waals forces. iso-Pentane, with a more branched structure, has a smaller surface area and thus a lower boiling point. neo-Pentane, being the most branched, has the smallest surface area and the lowest boiling point among the three.

Question 3

To prepare a pure sample of n-hexane using sodium metal as one reactant, the other reactant will be&#8230;&#8230;&#8230;&#10;A)n-propyl bromide&#10;B)Ethyl bromide and n-butyl bromide&#10;C)Ethyl chloride and n-butyl chloride&#10;D)Methyl bromide and n -pentyl chloride

Accepted Answer

Sodium metal is a strong reducing agent and can react with alkyl halides to produce alkanes. In this case, n-hexane can be prepared by reacting sodium metal with n-propyl bromide.

Question 4

In the preparation of Grignard reagent from haloalkane, the metal&#10;A)Mg&#10;B)Zn&#10;C)Li&#10;D)K

Accepted Answer

Mg (Magnesium) is the metal used in the preparation of Grignard reagents from haloalkanes.

Question 5

Sodium acetate can be converted to ethane by………. A)Heating with LiAlH₄ B)Electrolysing its aqueous solution C)Heating with sodalime D)Heating with calcium acetate

Accepted Answer

Electrolysis of an aqueous solution of sodium acetate leads to the Kolbe electrolysis reaction, which produces ethane as one of the products.

Question 6

Which of the following compounds is used in antiknock compositions to prevent the deposition of oxides of lead on spark plug, combustion chamber and exhaust pipe&#8230;&#8230;.&#10;A)Glycerol&#10;B)Glycol&#10;C)1, 2-dibromoethane&#10;D)Benzene

Accepted Answer

1, 2-dibromoethane is used in antiknock compositions to prevent the deposition of oxides of lead on spark plug, combustion chamber, and exhaust pipe. It acts as a scavenger for lead by forming volatile lead compounds that can be exhausted out, thus reducing the harmful deposits.

Question 7

Which of petroleum corresponds to kerosene oil……… A)C₁₅-C₁₈ B)C₁₀ - C₁₂ C)C₅ - C₉ D)C₁ -C₉

Accepted Answer

Kerosene typically consists of hydrocarbons containing between 10 to 12 carbon atoms per molecule, which corresponds to the carbon chain length range given in option B (C10-C12).

Question 8

In the reaction CH₃- Br+ 2Na+ Br-CH₃ , the product called …….. A)Wurtz reaction B)Aldol condensation C)Perkin's reaction D)Levit reaction

Accepted Answer

The reaction described is a Wurtz reaction, which involves the coupling of two alkyl halides in the presence of sodium metal to form a new carbon-carbon bond, leading to the formation of an alkane.

Question 9

Iodoethane reacts with sodium in the presence of dry ether. The product is&#8230;&#8230;..&#10;A)Pentane&#10;B)Propane&#10;C)Butene&#10;D)Butane

Accepted Answer

The reaction between iodoethane and sodium in the presence of dry ether is a Wurtz reaction, which involves the coupling of two alkyl halides in the presence of sodium metal. The product is an alkane with a carbon chain length that is the sum of the two reacting alkyl halides. In this case, two molecules of iodoethane (each with 2 carbon atoms) react to form butane, which has 4 carbon atoms.

Question 10

Which of the following is oxidised by KMnO₄ A)Methane B)Pentane C)Isobutane D)Neopentane

Accepted Answer

The answer of Which of the following is oxidised by...

Question 11

The most volatile compound is&#8230;&#8230;&#8230;.&#10;A)2, 2-dimethyl propane&#10;B)2-methyl butane&#10;C)Isobutane&#10;D)n-pentane

Accepted Answer

The answer of The most volatile compound is&#8230;&#8230;&#8230;.&#10;A)2, 2-dimethyl propane&#10;B)2-methyl...

Question 12

In Wurtz reaction, the reagent used is……….. A)Na B)liquid NH₃Na C)ether dry Na D)alcohol dry Na

Accepted Answer

The answer of In Wurtz reaction, the reagent used is&#8230;&#8230;&#8230;..&#10;A)Na&#10;B)liquid...

Question 13

Which of the following has highest octane number&#8230;&#8230;&#8230;&#8230;&#10;A)n-hexane&#10;B)n-heptane&#10;C)n-pentane&#10;D)2, 2, 4-trimethyl pentane

Accepted Answer

The answer of Which of the following has highest octane...

Question 14

What is freon-12&#8230;&#8230;.&#10;A)Pesticide&#10;B)Refrigerant&#10;C)Solvent&#10;D)Lubricant

Accepted Answer

The answer of What is freon-12&#8230;&#8230;.&#10;A)Pesticide&#10;B)Refrigerant&#10;C)Solvent&#10;D)Lubricant...

Question 15

The petrol having octane number 80 has&#8230;&#8230;&#8230;&#8230;&#10;A)20% normal heptane + 80% iso-octane&#10;B)80% normal heptane + 20% iso-octane&#10;C)20% normal heptane + 80% normal octane&#10;D)80% normal heptane + 20% normal octane

Accepted Answer

The answer of The petrol having octane number 80 has&#8230;&#8230;&#8230;&#8230;&#10;A)20%...

Question 16

Which of the following shows only one brominated compound&#8230;&#8230;&#8230;&#8230;&#10;A)Butene-2&#10;B)2, 2-dimethylpropane&#10;C)Butyne-1&#10;D)Butanol-3

Accepted Answer

The answer of Which of the following shows only one...

Question 17

Kerosene is used as fuel because it is&#8230;&#8230;&#8230;&#8230;.&#10;A)Less volatile&#10;B)More volatile&#10;C)Cheap&#10;D)Abundantly available

Accepted Answer

The answer of Kerosene is used as fuel because it...

Question 18

Which of the following statements is not true for ethane…………. A)It can be chlorinated with chlorine B)It can be catalytically hydrogenated C)When oxidised produces CO₂ and H₂O D)It is a homologue of iso-butane

Accepted Answer

The answer of Which of the following statements is not...

Question 19

Petroleum refining is &#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Distillation of petroleum to get different fractions&#10;B)Obtaining aromatic compounds from aliphatic compounds present in petroleum&#10;C)Cracking of petroleum to get gaseous hydrocarbons&#10;D)Purification of petroleum

Accepted Answer

The answer of Petroleum refining is &#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Distillation of petroleum to...

Question 20

The chemical added to leaded petrol to prevent the deposition of lead in the combustion chamber is&#8230;&#8230;&#10;A)Iso-octane&#10;B)Ethylene dibromide&#10;C)Tetraethyl lead&#10;D)Mercaptan

Accepted Answer

The answer of The chemical added to leaded petrol to...

Question 21

In the commercial gasolines, the type of hydrocarbons which are more desirable is&#8230;&#8230;&#8230;..&#10;A)Branched hydrocarbon&#10;B)Straight-chain hydrocarbon&#10;C)Linear unsaturated hydrocarbon&#10;D)Toluene

Accepted Answer

The answer of In the commercial gasolines, the type of...

Question 22

Which of the following is not formed by the reaction of Cl₂on CH₄in sunlight………. A)CHCl₃ B)CH₃Cl C)CH₃CH₃ D)CH₃CH₂CH₃

Accepted Answer

The answer of Which of the following is not formed...

Question 23

Which of the following has the highest boiling point&#8230;&#8230;&#8230;..&#10;A)Neopentane&#10;B)n-butane&#10;C)n-heptane&#10;D)Isobutane

Accepted Answer

The answer of Which of the following has the highest...

Question 24

Which gives CH₄ when treated with water…….. A)Silicon carbide B)Calcium carbide C)Aluminium carbide D)Iron carbide

Accepted Answer

The answer of Which gives CH₄ when treated with water…….. A)Silicon...

Deck 1: Fundamental of Organic Chemistry