The molecular formula of hexamethylene diammine adipate (monomer of nylon-66) is
A$$\mathrm{C_{12}H_{22}O_2N_2}$$
B$$\mathrm{C_{10}H_{26}O_4N_2}$$
C$$\mathrm{C_{12}H_{26}O_4N_2}$$
D$$\mathrm{C_{12}H_{24}O_3N_2}$$
Answer & Solution
Correct answer: C. $$\mathrm{C_{12}H_{26}O_4N_2}$$
Hexamethylene diamine is $\mathrm{H_2N-(CH_2)_6-NH_2}$, which has formula $\mathrm{C_6H_{16}N_2}$. Adipic acid is $\mathrm{HOOC-(CH_2)_4-COOH}$, which has formula $\mathrm{C_6H_{10}O_4}$.<br><br>Hexamethylene diamine adipate is formed by combining these in a $1:1$ ratio to give the salt, so the total formula is $$\mathrm{C_6H_{16}N_2 + C_6H_{10}O_4 = C_{12}H_{26}O_4N_2}$$ After checking the options, this matches option $\mathrm{C}$.
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