ICSE Class 10 Hydrocarbons — Mock Test

Free online mock test for Hydrocarbons (ICSE Class 10 Chemistry) — 76 competency-based questions with instant marking. Try the samples below, then take the full test free.

Sample questions

1. 1.The characteristic class of reactions shown by arenes such as benzene is:
   • A.Electrophilic substitution
   • B.Electrophilic addition
   • C.Nucleophilic substitution
   • D.Free radical addition
2. 2.Assertion (A): The phenolic -OH group is an ortho and para directing group. Reason (R): The resonance structures of phenol show increased electron density at the ortho and para positions of the ring.
   • A.Both A and R are true and R is the correct explanation of A
   • B.Both A and R are true but R is NOT the correct explanation of A
   • C.A is true but R is false
   • D.A is false but R is true
3. 3.Assertion (A): The reaction of sodium metal with ethyne can be used to distinguish ethyne from ethene and ethane. Reason (R): Ethyne reacts with sodium to liberate dihydrogen, whereas ethene and ethane do not react in this way.
   • A.Both A and R are true and R is the correct explanation of A
   • B.Both A and R are true but R is NOT the correct explanation of A
   • C.A is true but R is false
   • D.A is false but R is true
4. 4.The carbon-carbon double bond in alkenes consists of:
   • A.One sigma bond and one pi bond
   • B.Two sigma bonds
   • C.Two pi bonds
   • D.One sigma bond and two pi bonds
5. 5.Assertion (A): Alkenes readily undergo electrophilic addition reactions. Reason (R): The pi bond is a source of loosely held mobile electrons that attract reagents in search of electrons.
   • A.Both A and R are true and R is the correct explanation of A
   • B.Both A and R are true but R is NOT the correct explanation of A
   • C.A is true but R is false
   • D.A is false but R is true