Condensation polymers: nylon, polyester, bakelite

36 questions on Condensation polymers: nylon, polyester, bakelite from the Polymers chapter: 8 NEET level, 14 JEE Main, 14 JEE Advanced. Each one opens with its answer and solution.

• Nylon 6,6 is obtained by polymerising which pair of monomers? NEET level
• Which of the following is a polyester? NEET level
• Bakelite is a thermosetting polymer formed by condensation of phenol with which compound? NEET level
• The characteristic linkage joining the monomer units in nylon 6,6 is NEET level
• A linear chain of nylon 6,6 is built from n molecules of hexamethylenediamine and n molecules of adipic acid, each monomer joining only through its two function... JEE Main level
• Terylene is manufactured from JEE Main level
• Which statement about novolac, the first-stage product in one route to bakelite, is correct? JEE Main level
• The repeat unit of nylon 6 is -[NH-(CH2)_x-CO]-. The value of x is JEE Main level
• Take the repeat unit of nylon 6 as -[NH-(CH2)5-CO]- (113 g/mol) and of nylon 6,6 as -[NH-(CH2)6-NH-CO-(CH2)4-CO]- (226 g/mol). Two samples, one of each polymer,... JEE Main level
• Assertion (A): Bakelite, once set, cannot be softened and remoulded by heating. Reason (R): Bakelite has a three-dimensional network of methylene bridges betwee... JEE Main level
• Which of the following pairs of polymer and monomer(s) is correctly matched? JEE Main level
• Which of the following statements about nylon 6,6 are correct? JEE Advanced level
• Which of the following statements about phenol-formaldehyde resins are correct? JEE Advanced level
• For step-growth polymerisation of an equimolar mixture of a diamine and a diacid, use the Carothers equation overlineX_n = 1/(1-p), where p is the fraction of f... JEE Advanced level
• Take the repeat unit of Terylene as -[O-CH2-CH2-O-CO-C6H4-CO]- (benzene ring 1,4-disubstituted, formula C10H8O4). Which statements are correct? JEE Advanced level
• Terylene has the repeat unit -[O-CH2-CH2-O-CO-C6H4-CO]- (C10H8O4, 192 g/mol), made from ethylene glycol and terephthalic acid, HOOC-C6H4-COOH (166 g/mol). Negle... JEE Advanced level
• Equimolar hexamethylenediamine and adipic acid are polymerised until p = 0.995 of the functional groups have reacted. Use overlineX_n = 1/(1-p) for the number-a... JEE Advanced level
• A sample of nylon 6,6 has a number-average molar mass of 28000 g mol^-1. The repeat unit is -[NH-(CH2)6-NH-CO-(CH2)4-CO]-, formula C12H22N2O2 (atomic masses C 1... JEE Advanced level
• Nylon 6,6 is prepared from NEET level
• Terylene (Dacron) is made by polymerising NEET level
• Bakelite is best described as NEET level
• The characteristic linkage joining the repeat units in nylon 6,6 is the NEET level
• Nylon 2-nylon 6, a biodegradable polyamide, is a copolymer of JEE Main level
• The biodegradable polyester PHBV is a copolymer of JEE Main level
• Which description of novolac is correct? JEE Main level
• The acid components of Terylene and of glyptal are, respectively JEE Main level
• When Terylene is made commercially from dimethyl terephthalate and ethylene glycol, the small molecule eliminated is JEE Main level
• Select all the polymers that contain amide linkages in the chain. JEE Main level
• In which of the following is a small molecule (water) lost in the step that joins the monomers? JEE Main level
• Hexamethylenediamine (C6H16N2, 116) of mass 580 g is polymerised with the stoichiometric amount of adipic acid (C6H10O4, 146) to a long nylon 6,6 chain (end gro... JEE Advanced level
• Terylene (repeat unit C10H8O4, 192) of mass 960 g is made by the dimethyl terephthalate route from dimethyl terephthalate and ethylene glycol (end groups ignore... JEE Advanced level
• Which monomer combination gives a linear, thermoplastic condensation polymer rather than a cross-linked network? JEE Advanced level
• Which statement distinguishes step-growth (condensation) polymerisation of adipic acid and hexamethylenediamine from chain-growth addition polymerisation? JEE Advanced level
• Assertion (A): Novolac, made from phenol and formaldehyde, is a fusible, soluble material that hardens on heating after addition of hexamethylenetetramine. Reas... JEE Advanced level
• Select all the correct statements about phenol-formaldehyde polymers. JEE Advanced level
• Select all the polymers that are biodegradable. JEE Advanced level