Question 25
Question 25 of 40
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Periodic Table
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Older MCQs might not have the typical A, B, C, D choices. They have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such combinations to the answer.
A 1, 2 and 3 are correct
B 1 and 2 only are correct
C 2 and 3 only are correct
D 1 only is correct
Topics Tested
16. Hydroxy compounds
16.1. Alcohols

deduce the presence of a CH\(_3\)CH(OH)- group in an alcohol, CH\(_3\)CH(OH)-R, from its reaction with alkaline I\(_2\)(aq) to form a yellow precipitate of tri-lodomethane and an ion, \( RCO_2^-\)

14. Hydrocarbons
14.2. Alkenes

recall the reactions (including reagents and conditions) by which alkenes can be produced: (a) elimination of HX from a halogenoalkane by ethanolic NaOH and heat (b) dehydration of an alcohol, by using a heated catalyst (e.g. \( Al_2O_3 \)) or a concentrated acid (e.g. concentrated \( H_2SO_4 \)) (c) cracking of a longer chain alkane