(B) Glyptal is a polyester formed by the condensation polymerization of ethylene glycol $(HO-CH_2-CH_2-OH)$ and phthalic acid $(C_6H_4(COOH)_2)$.The r

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(B) Glyptal is a polyester formed by the condensation polymerization of ethylene glycol $(HO-CH_2-CH_2-OH)$ and phthalic acid $(C_6H_4(COOH)_2)$.The reaction is as follows:$n \ HO-CH_2-CH_2-OH + n \ C_6H_4(COOH)_2 \rightarrow \text{Glyptal} + 2n \ H_2O$Thus,phthalic acid is treated with ethylene glycol to obtain glyptal.