concept testing

1. Which of the following compounds react most readily with Br(g)?

• (a) C₂H₂

• (b) C₃H₆

• (c) C₂H₄

• (d) C₄H₁₀

2. When propene reacts with HBr in the presence of peroxide, it gives rise to

• (a) allyl bromide

• (b) isopropyl bromide

• c) n-propyl bromide

• (d) 3-bromopropane

3. Find the alkene with maximum stability

• (a) cis-2-Butene

• (b) trans-2-Butene

• (c) 1-Butene

• (d) All have the same stability

4. Ethylene bromide on treatment with Zn gives

• (a) Alkyne

• (b) Alkene

• (c) Alkane

• (d) All of the above

5. Which of the following reactions is common in alkenes?

• a) Addition

• (b) Elimination

• (c) Substitution

• (d) Superposition

6. Cis-trans isomerism in alkenes is due to

• (a) chiral carbon

• b) free rotation about single bond

• (c) free rotation about the double bond

• d) restricted rotation about the double bond

7. Which of the following will form 2 acetaldehyde molecules on ozonolysis?

• (a) 1-pentene

• (b) 2-pentene

• (c) 1-butene

• (d) 2-butene

8. Which of the following reagents will form 1-propanol from propene?

• (a) B₂H₆, H₂O₂, OH^–

• (b) Aq. KOH

• (c) H₂O, H₂SO₄

• (d) Hg(OAc)₂, NaBH₄/H₂O

Geometrical isomerism is exhibited by

• 2-Butene

• 2-Butyne

• 2-Butenol

• Butanol

The bond angle between H-C-C bonds in ethane is

• (a) 120°

• (b) 180°

• (c) 109°

• (d) 109.5°