Free Chemistry of Hydrocarbons MCQs with Answers
1,091 Chemistry of Hydrocarbons MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Hydrocarbons are studied through the structures and reactions of alkanes, alkenes, alkynes and aromatic compounds. Coverage includes free radical substitution in alkanes, electrophilic addition to carbon-carbon multiple bonds, benzene substitution, aromatic stability and the difference between addition reactions of alkenes and substitution reactions of benzene.
Last updated
Read the Chemistry of Hydrocarbons notesFree MDCAT chapter notes with key terms1,091 questions · page 38 of 55
- A. Hydration
- B. Sulphonation
- C. Hydrogenation
- D. Dehydrogenation
Explanation: The reaction used in the preparation of vegetable ghee from oil is called hydrogenation.
Correct answer: Hydrogenation- A. Cyclic structure
- B. Three alternating double and single bonds
- C. Delocalization of pi-electrons
- D. All of these
Explanation: The explanation for this question will be added soon!
Correct answer: All of these- A. Alkanes and alkenes can be distinguished by Br2/CCl4, Baeyer's test
- B. Alkanes and alkynes can be distinguished by Br2/CCl4, Baeyer's test
- C. Alkyne-1 and alkyne-2 can be distinguished by Cu2Cl2/NH4OH, AgNO3/NH4OH
- D. A and C only
Explanation: alkanes and alkenes can be distinguished using the Baeyer's test, which involves the reaction of the compounds with bromine (Br2) in…
Correct answer: A and C only- A. 10 moles
- B. 20 moles
- C. 8 moles
- D. 4 moles
Explanation: The explanation for this question will be added soon!
Correct answer: 10 moles- A. Alkane
- B. Ether
- C. Alkene
- D. Alkyne
Explanation: The explanation for this question will be added soon!
Correct answer: Alkene746. The reaction of benzene with bromine in the presence of FeBr3 follows the mechanism of _ reaction:
- A. Electrophilic addition
- B. Nucleophilic substitution
- C. Electrophilic substitution
- D. Nucleophilic addition
Explanation: Br2 + FeBr3 ---> Br+ + FeBr4-According to the equation above FeBr3 is used to produce an electrophile Br+.
Correct answer: Electrophilic substitution- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Option A When haloalkane or alkyl halide with a β- hydrogen atom is heated with alcoholic solution of potassium hydroxide (alc.KOH), the…
Correct answer: Option A- A. 3, 3-Dimethyl-3-hexene
- B. 3, 4-Dimethyl-3-hexene
- C. 3-Hexene
- D. 2,3-Dimethyl-1-hexene
Explanation: The explanation for this question will be added soon!
Correct answer: 3, 4-Dimethyl-3-hexene- A. FeCl2
- B. FeCl4-
- C. Cl+
- D. Cl2
Explanation: The explanation for this question will be added soon!
Correct answer: Cl+- A. ene
- B. ic
- C. One
- D. yl
Explanation: yl is correct. When naming organic compounds, particularly alkanes with substituents, the substituent is named by replacing the "-ane"…
Correct answer: yl- A. Sp
- B. Sp³
- C. Sp²
- D. dsp²
Explanation: In alkanes, each carbon atom forms sigma bonds with four other atoms, either carbon or hydrogen.
Correct answer: Sp³752. Designate the location of double bond by using the number of the.....of the double bond as a prefix
- A. 2nd atom
- B. 1st atom
- C. 3rd atom
- D. Last atom
Explanation: 2 pentene has double bond between 2 and 3 carbon
Correct answer: 1st atom753. Alkenes show _ isomerism Unsaturated oils become partially saturated when they are reacted with
- A. Only structural Carbon
- B. Only geometrical Hydrogen
- C. Both geometrical and structural oxygen
- D. Neither geometrical nor structural nitrogen
Explanation: Alkenes exhibit both geometrical and structural isomerism due to the presence of a double bond.
Correct answer: Both geometrical and structural oxygen- A. Anti markovnikov's rulepotassium magnate
- B. Markovnikov's rulesodium magnate
- C. Kharish effectcalcium carbonate
- D. Peroxide effectcalcium magnate
Explanation: In the addition reaction of hydrogen bromide to unsymmetrical alkenes, according to Markovnikov's rule, the hydrogen atom of HBr adds to…
Correct answer: Markovnikov's rulesodium magnate- A. O2
- B. Br2
- C. HCl
- D. NaNH2
Explanation: 1-butyne being a terminal alkyne will react with NaNH2 to give sodium salt. However 2-butyne will not react as it is an internal alkyne.
Correct answer: NaNH2- A. Formic acid
- B. Oxalic acid
- C. Acetic acid
- D. Hydrochloric acid
Explanation: The end product of oxidation of ethyne is Oxalic acid. Alkynes oxidize into vicinal diketones (1,2 diketones) and are then further…
Correct answer: Oxalic acid- A. Benzene is a liquid with sweet aroma smell
- B. Benzene is flammable in air
- C. Benzene is soluble in water
- D. The boiling point of Benzene is 80.1C
Explanation: Benzene is a non-polar molecule, while water is a polar molecule. As a result, benzene is immiscible in water.
Correct answer: Benzene is soluble in water- A. Benzene
- B. Nitrobenzene
- C. Toluene
- D. Chlorobenzene
Explanation: Toluene is the most readily sulfonated of the compounds listed because it has an electron-donating methyl group.
Correct answer: Toluene- A. 3
- B. 6
- C. 12
- D. 18
Explanation: Each of the six carbon atoms in a benzene ring is sp² hybridized. Each sp² hybridized atom has three sp² hybrid orbitals.
Correct answer: 18- A. 3
- B. 5
- C. 2
- D. 4
Explanation: The problem involves an organic compound (A) reacting with excess CH3MgI, which is a Grignard reagent.
Correct answer: 4