Complete Table 5.1.

Product name	Structure
hexane	Table answer hexane_Structure
2-methylpentane	Table answer methylpentane_Structure

5(a)(ii)AlkanesEasy1 mark

Name the mechanism for the reaction of propane and

C l_{2} (g)

in the presence of ultraviolet light.

5(b)(i)Electron Configuration OrbitalsMedium1 mark

The mechanism for this reaction involves three stages.

stage 1 initiation stage 2 propagation stage 3 termination

During the initiation reaction, a chlorine free radical is produced.

Complete Figure 5.1 to describe the arrangement of electrons in a chlorine free radical.

Draw with the mouse or a finger.

5(b)(ii)AlkanesHard2 marks

Suggest a reaction sequence of two propagation reactions that result in

C H_{3} C H_{2} C H_{3}

forming

C H_{3} C H_{2} C H_{2} C l

propagation reaction 1:

C H_{3} C H_{2} C H_{3} + \dots \to \dots

0 words

propagation reaction 2:

\dots \to C H_{3} C H_{2} C H_{2} C l + \dots

0 words

5(b)(iii)AlkanesHard2 marks

Suggest a reaction sequence of one propagation reaction followed by a termination reaction that results in

C H_{3} C H_{2} C H_{3}

forming

(C H_{3})_{2} C H C H (C H_{3})_{2}

propagation reaction 3:

C H_{3} C H_{2} C H_{3} + \dots \to \dots

0 words

termination reaction:

\dots \to (C H_{3})_{2} C H C H (C H_{3})_{2}

0 words

5(c)(i)Mass Spectrometry Infrared SpectroscopyHard2 marks

Compound A has the molecular formula

C H_{2} C l_{2}

. Figure 5.2 shows the mass spectrum of A.

Explain the difference in relative abundance of the peaks at

m / e = 35

and

m / e = 37

Answer

0 words

5(c)(ii)Mass Spectrometry Infrared SpectroscopyHard2 marks

Complete Table 5.2.

$m / e$ value of peak	molecular formula of species responsible for peak
84	Table answer r1_molecular formula of species responsible for peak 0 words
86	Table answer r2_molecular formula of species responsible for peak 0 words
88	Table answer r3_molecular formula of species responsible for peak 0 words