JPJC 2026 Alkene MCQ

2026 JPJC JC1 H2 Chemistry (9476) 1 [Turn Over JURONG PIONEER JUNIOR COLLEGE 2026 JC1 H2 Chemistry (9476) MCQ Quiz Topic 10: Alkenes Name : __________________________________________ 5 Class : 26S ___ Date : ____________ Duration : 10 minutes 1 Which of the following transformation has the correct reaction conditions? [(alc) indicates the compound is in an alcohol solvent.] A CH3CH2CH=CH2(l) + HI(aq) CH3CH2CHICH3 B CH3CH2CHBrCH3(alc) + NaOH(alc) CH3CH=CHCH3 + NaBr + H2O C CH3CH2CH=CH2(l) + KMnO4(aq) CH3CH2COOH D CH3CH2CH=CH2(l) + Br2(CCl4) CH3CH2CHBrCH2Br ( ) 2 2-methylbuta-1,3-diene, CH2=C(CH3)CH=CH2 is used as a monomer in the manufacture of synthetic rubbers. Which compound would not produce this monomer on heating with concentrated H3PO4? A (CH3)2C(OH)CH(OH)CH3 B HOCH2CH(CH3)CH2CH2OH C HOCH2CH(CH3)CH(OH)CH3 D HOCH2C(CH3)(OH)CH2CH3 ( ) 3 When ethene reacts with ICl in the presence of aqueous NaBr, what are the possible products formed? 1 2 3 4 A 1 and 2 only B 1 and 3 only C 2 and 4 only D 3 and 4 only ( ) heat heat cold uv light

2026 JPJC JC1 H2 Chemistry (9476) 2 4 Limonene is an oil formed in the peel of citrus fruits. Which of the following is the major product formed when hydrogen bromide reacts with limonene at room temperature? A B C D ( ) 5 Compound Q has the following structure. (CH3)2C=CHCH2CH=CH2 What is produced when Q is treated with an excess of hot concentrated acidified KMnO4? 1 (CH3)2C(OH)CH(OH)CH2CH(OH)CH2OH 2 CH3COCH3 3 CH3CH2CO2H 4 HO2CCH2CO2H A 1 only B 2 and 4 only C 3 and 4 only D 2, 3 and 4 only ( ) Br Br