Nylon $66$ was the first truly synthetic polymer fiber. It is formed from the monomers adipic acid and hexamethylene diamine, each of which can be formed quite easily from basic starting materials.

$(4)$

From the list of available reagents, outline the synthesis of adipic acid.

Experimental Conditions

a$.H_2,Pd$

b$.$ conc. $HCl,$ heat

c$.$ NaCN

d$.C{l}_2,C{H}_{2}C{l}_2$

e$.H_3{O}^{+},$ heat

f$.C{l}_2,$ UV light

g$.$ tert$-$butoxide

h$.O_3$;$H_2{O}_2$

i$.SOC{l}_2$

j$.N{H}_3$

k$.LiAl{H}_4$

Enter the letters of the reactions you wish to use, in the order you wish to use them. Do not use punctuation or spaces.

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