MCQs on Alkyne

Alkynes are unsaturated hydrocarbons. There is at least one C-C triple bond present in alkynes. The general formula of an alkyne is C_nH_2n-2. Acetylene or Ethyne is the simplest alkyne. Alkynes are acidic in nature. They show electrophilic addition reaction and polymerisation reaction.

1. Ethyne and Ethane can be separated from a mixture by passing it through

(a) Pyrogallol

(b) Charcoal powder

(c) Concentrated H₂SO₄

(d) Ammonical Cu₂Cl₂

2. 1-butyne and 2-butyne can be identified by using which of the following reagents?

(a) O₂

(b) Br₂

(c) NaNH₂

(d) HCl

3. Which of the following is used for welding?

(a) CH₄

(b) C₂H₂

(c) C₂H₆

(d) C₂H₄

4. The product formed in the reaction of propyne with dilute H₂SO₄ and HgSO₄ is

(a) Propyl hydrogen sulphate

(b) Propanone

(c) Propanal

(d) Propanol

5. Polymerisation product of propyne is

(a) Benzene

(b) Ethyl benzene

(c) Propyl benzene

(d) Mesitylene

6. The product formed in the reaction of ethyne with dilute H₂SO₄ and Hg²⁺ is

(a) Ethyl hydrogen sulphate

(b) Methoxymethane

(c) Ethanal

(d) Ethanol

7. In the ozonolysis reaction, acetylene forms

(a) Formaldehyde

(b) Glycol

(c) Glyoxal, formic acid

(d) None of the above

8. Acetylene is oxidised by KMnO₄ to form

(a) Acetic acid

(b) Ethyl alcohol

(c) Ethylene glycol

(d) Oxalic acid

9. Find Z in the following reaction

(a) Ethyl bromide

(b) Ethylene bromide

(c) Ethylidene bromide

(d) Ethanol

10. When ethyne is passed through a red hot tube, _______ is formed

(a) Cyclohexane

(b) Neoprene

(c) Benzene

(d) Ethane

Answer

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Additional reading:

• NEET Chemistry Syllabus
• NEET Chemistry Important Topics
• NEET Chemistry MCQs
• How to Score 160 Plus in NEET Chemistry
• NEET Chemistry Weightage
• Chemistry Formulas for NEET