Free Chemistry of Hydrocarbons MCQs with Answers

• A. C6H5
• B. C6H5-C
• C. C6H5-CH
• D. C6H5-CH2-

Explanation: The benzyl radical is represented as C6H5-CH2- and is derived from toluene.

• A. Toluene
• B. Ethyl benzene
• C. n-Propyl benzene
• D. All

Explanation: In the presence of K2Cr2O7 (potassium dichromate), only alkyl side chains that are benzylic (next to a benzene ring) or allylic can be…

• A. C8H5CH2Cl
• B. C6H5CHCl2
• C. C8H5-CH=CHCl
• D. None of the above

Explanation: Benzal chloride is represented as C6H5CHCl2. It is a benzene ring with a chloromethyl group attached

• A. Glycodime
• B. Benzaldehyde
• C. Glycol
• D. Glyoxal

Explanation: The hydrolysis of Benzenetriozonide will yield three moles of glyoxal. Glyoxal is formed by the hydrolysis of the ozonide intermediate…

• A. iso-alkane
• B. normal-alkane
• C. neo-alkane
• D. branched-alkane

Explanation: Alkanes with a methyl group on the main chain at the 2nd carbon are referred to as neo-alkanes.

• A. saturated hydrocarbon
• B. unsaturated hydrocarbon
• C. paraffins
• D. both a & c

Explanation: Alkanes are known as saturated hydrocarbons (a) and paraffins (c).

• A. alkene & H₂
• B. alkene & O
• C. alkene & N₂
• D. alkyne & Cl₂

Explanation: Sabatier-Senderens reaction involves the hydrogenation of alkynes to form alkenes in the presence of a nickel catalyst.

• A. ketone
• B. aldehyde
• C. alkane
• D. all of the above

Explanation: Clemmensen's reduction involves the reduction of both ketones and aldehydes to form alkanes.(a) ketone: This is correct.

• A. 2
• B. 3
• C. 4
• D. 6

Explanation: Alkanes with up to 2 carbon atoms are typically gases at room temperature.

• A. C2H6
• B. C2H4
• C. C2H2
• D. CH4

Explanation: Acetylene (C2H2) is used in the manufacturing of urea fertilizer.

• A. less reactivity
• B. addition reactions
• C. substitution reactions
• D. none

Explanation: In unsaturated hydrocarbons like alkenes and alkynes, π-electrons favor addition reactions due to their electron-rich nature.

• A. polyacetylene
• B. benzene
• C. chloroprene
• D. divinyl acetylene

Explanation: Vinylacetylene combines with HCl to form divinyl acetylene.

• A. sulfuric acid
• B. nitric acid
• C. hydrofluoric acid
• D. hydrochloric acid

Explanation: In the given options, hydrochloric acid (HCl) does not form hydrogen bonds in its liquid state.

• A. H2O
• B. H2S
• C. BF3
• D. NH3

Explanation: BF3 (boron trifluoride) is not a nucleophile. A nucleophile is a species that donates an electron pair to form a new bond with an…

• A. Nylon-6,6
• B. Polystyrene
• C. Terylene
• D. Epoxy resin

Explanation: Polystyrene is an example of an addition polymer. Addition polymers are formed by the repeated addition of monomer units without the…

• A. 12
• B. 8
• C. 16
• D. 4

Explanation: Fructose is a monosaccharide with the chemical formula C₆H₁₂O₆. It contains three chiral centers, which are carbon atoms bonded to four…

• A. C6H6 + NH3
• B. C6H6 + CH4
• C. C6H6 + CH3Cl
• D. C6H6 + CH3COCl

Explanation: Friedel-Crafts alkylation is a reaction used to introduce an alkyl group (R-) to an aromatic ring (Ar-).

• A. In which atoms of C are in a series
• B. Not in a series
• C. In which each carbon is attached at least with three other carbon atom
• D. None

Explanation: Straight chain hydrocarbons refer to hydrocarbons (compounds containing only carbon and hydrogen) in which carbon atoms are arranged in a…

• A. HCl
• B. NaOH
• C. H2O
• D. NaHCO3

Explanation: The process to convert benzene sulfonic acid back to benzene is called desulfonation or hydrolysis.

• A. Graphite
• B. Coal
• C. Coke
• D. Diamond

Explanation: Isomorphous refers to crystals having the same spatial arrangement of atoms, leading to similar shapes and properties.Both diamond and…