Free Test Alkenes – NEET

Q1: What is the general formula of alkenes?

A. CnH2n+2 B. CnH2n C. CnH2n-2 D. CnHn

Q2: Which test is used to distinguish alkenes from alkanes?

A. Tollen’s test B. Baeyer’s test C. Fehling’s test D. Iodoform test

Q3: What is the product when ethene reacts with HBr?

A. Ethane B. Bromoethane C. 1,2-dibromoethane D. Chloroethane

Q4: Markovnikov’s rule is applicable to:

A. Free radical addition B. Nucleophilic substitution C. Electrophilic addition D. Elimination reactions

Q5: Hydroboration-oxidation of alkenes results in:

A. Markovnikov alcohol B. Anti-Markovnikov alcohol C. Alkyne D. Aldehyde

Q6: Which alkene shows geometrical isomerism?

A. Ethene B. Propene C. But-2-ene D. Methene

Q7: Which reagent adds to alkenes via syn addition?

A. HBr B. Cl₂ C. BH₃ D. KMnO₄ (cold)

Q8: What is the IUPAC name of CH₃–CH=CH₂?

A. Propene B. Propyne C. Butene D. Ethene

Q9: In the presence of peroxides, HBr adds to alkenes via:

A. Carbocation B. Free radical C. Carbanion D. Electrophile

Q10: Which is more reactive in electrophilic addition?

A. Alkane B. Alkyne C. Alkene D. Benzene

Q11: Oxidation of ethene with cold dilute KMnO₄ gives:

A. Ethanoic acid B. Ethanol C. Ethane D. Ethane-1,2-diol

Q12: Alkenes can be formed by:

A. Addition reaction B. Hydrolysis C. Dehydration of alcohols D. Oxidation of alkynes

Q13: Which reaction does not proceed with alkene?

A. Hydrogenation B. Halogenation C. Nitration D. Hydrohalogenation

Q14: Which compound is a mono-substituted alkene?

A. Ethene B. Propene C. But-1-ene D. Pent-2-ene

Q15: Alkene reacts with Br₂ to form:

A. Alkane B. Dibromoalkane C. Alcohol D. Aldehyde

Q16: The hybridization of carbon atoms in ethene is:

A. sp B. sp² C. sp³ D. None

Q17: Pi bond in alkenes is formed by:

A. s–s overlap B. p–p sideways overlap C. s–p head-on overlap D. p–p head-on overlap

Q18: Which reaction converts alkene to alkane?

A. Hydrogenation B. Halogenation C. Hydration D. Dehydration

Q19: Electrophilic addition involves attack by:

A. Nucleophile B. Base C. Electrophile D. Radical

Quiz for Alkenes