Nylon 6, 6 is a condensation polymer of two monomers $X$ and $Y$. The number of $-\mathrm{CH}_2-$ groups in…
Nylon 6, 6 is a condensation polymer of two monomers $X$ and $Y$. The number of $-\mathrm{CH}_2-$ groups in $X$ and $Y$ are respectively
6,4
6,6
5,6
6,2
Solution
Nylon-6,6 is synthesised by polycondensation of hexamethylenediamine and adipic acid.
$
\begin{aligned}
& n \mathrm{HOOC}-\left(\mathrm{CH}_2\right)_4-\mathrm{COOH}+n \mathrm{H}_2 \mathrm{~N}-\left(\mathrm{CH}_2\right)_6-\mathrm{NH}_2 \\
& +\mathrm{CO}-\left(\mathrm{CH}_2\right)_4-\mathrm{CO}-\mathrm{NH}-\left(\mathrm{CH}_2\right)_6-\mathrm{NH}+_n \\
& +(2 n-1) \mathrm{H}_2 \mathrm{O}
\end{aligned}
$
Number of $-\mathrm{CH}_2$-group is 6 in hexamethylene-diamine and 4 in adipic acid