MCQs on Alkene
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. Baeyer’s reagent is used to detect
(a) glucose
(b) double bonds
(c) oxidation
(d) reduction
8. Which of the following will form 2 acetaldehyde molecules on ozonolysis?
(a) 1-pentene
(b) 2-pentene
(c) 1-butene
(d) 2-butene
9. 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
10. Geometrical isomerism is exhibited by
(a) 2-Butene
(b) 2-Butyne
(c) 2-Butenol
(d) Butanol
Answer
