Q32 of 9701_w23_qp_12

Question 32

Question 32 of 40

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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

14. Hydrocarbons

14.1. Alkanes

describe the mechanism of free-radical substitution with reference to the initiation, propagation and termination steps

15. Halogen compounds

15.1. Halogenoalkanes

recall the reactions (reagents and conditions) by which halogenoalkanes can be produced: (a) the free-radical substitution of alkanes by \( Cl_2 \) or \( Br_2 \) in the presence of ultraviolet light, as exemplified by the reactions of ethane (b) electrophilic addition of an alkene with a halogen, \( X_2 \), or hydrogen halide, \( HX(g) \), at room temperature (c) substitution of an alcohol, e.g. by reaction with \( HX(g) \); or with KCl and concentrated \( H_2SO_4 \) or concentrated \( H_3PO_4 \); or with \( PCl_3 \) and heat; or with \( PCl_5 \); or with \( SOCI_2 \)