hydrocarbons-quiz-3

Hydrocarbons Quiz-3

Dear Readers,

The one subject in NEET which is candidates who can easily attain good marks is Chemistry. That's the reason, often, one doesn’t pay notice and choose to compromise it. But if one wants to rank above others, the tip is to be thorough with NEET chemistry concepts. The understanding of reactions and definite basic understanding is what requires major attention in Chemistry but once done it only gets simpler from there. The main focus on the to-do list should be on getting a hang of the NCERT syllabus of NEET chemistry..

Q1. Petroleum refining is:

•  Obtaining aromatic compounds from aliphatic compounds in petroleum
•  Cracking of petroleum to get gaseous hydrocarbons
•  Purification of petroleum
•  Distillation of petroleum to get different fractions

Solution
(d) The refining of petroleum is distillation process.  

Q2.An anaesthetic narcylene is commercial name of:

•  C₂ H₄
•  C₂ H₂
•  CHCI₃
•  C₆ H₅ Cl

Solution

(b) C₂ H₂ is commercially named narcylene.

Q3. What is the molecular formula of the product formed when benzene is reacted with ethyl chloride in presence of anhydrous aluminium chloride? 

•  C₈ H₁₀
•  C₆ H₆
•  C₈ H₈
•  C₆ H₅ Cl

Solution

Q4. The olefin which on ozonolysis gives CH₃ CH₂ CHO and CH₃ CHO is:

•  1-butene
•  2-butene
•  1-pentene
•  2-pentene

Solution

Q5.The carbon-carbon bond length in benzene is

•  In between C₂ H₆ and C₂ H₄
•  Same as in C₂ H₄
•  In between C₂ H₆ and C₂ H₂
•  In between C₂ H₄ and C₂ H₂

Solution
  (a) The carbon-carbon bond length in benzene (1.39 Å) in between that of C-C(1.54 Å)and C=C(1.34 Å) i.e., in between that of C₂ H₆ and C₂ H₄.  

Q6. The test for unsaturation is confirmed by the decolourisation of which of the following?

•  Iodine water
•  CuSO₄ solution
•  Bromine water
•  All of these

Solution
(c) By adding bromine water to a solution, if the colour of bromine water decolourise then the compound is unsaturated. This is a confirmatory test for unsaturation.  

Q7.Which of the following reagents cannot be used to locate the position of triple bond in CH₃—C≡C—CH₃?

•  Br₂
•  O₃
•  Cu⁺
•  KMnO₄

Solution

(c) It is a non-terminal alkyne.

Q8.n-hexadecane (cetane) has cetane number:

•  100
•  Zero
•  90
•  110

Solution
(a) These are arbitrarily assigned values.  

Q9.Action of NH₃ over C₂ H₂ at high temperature gives:

•  Amine
•  Furan
•  Thiophene
•  Pyrrole

Solution

(d) Pyrrole

Q10. Propyne on oxidation with SeO₂ gives:

•  CHOCHO
•  CH₃ CH₂ CHO
•  CH₃ COCHO
•  CHOCH₂ CHO

Solution