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Addition polymerisation and mechanism

36 questions on Addition polymerisation and mechanism from the Polymers chapter: 7 NEET level, 14 JEE Main, 15 JEE Advanced. Each one opens with its answer and solution.

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A small amount of a chain transfer agent (such as a thiol or CCl4) is added to a free radical polymerisation. The main effect is that JEE Main level
A Ziegler-Natta catalyst consists of JEE Main level
In which of the following is the main chain (backbone) made of carbon atoms only? JEE Advanced level
Which monomer is best suited to cationic addition polymerisation (for example with BF3 and a trace of water)? JEE Main level
In the free radical polymerisation of styrene, CH2=CH-C6H5, a growing radical attacks a monomer molecule. The attack occurs JEE Main level
Which statements about free radical addition polymerisation are correct? JEE Advanced level
Which statements about cationic addition polymerisation are correct? JEE Advanced level
Which statements about natural rubber and related materials are correct? JEE Advanced level
In a free radical polymerisation the rate of polymerisation is R_p = k[M][I]^1/2 and the average degree of polymerisation is proportional to [M]/[I]^1/2, where ... JEE Advanced level
Low density polythene (LDPE) and high density polythene (HDPE) are both made from ethene. Which statement is correct? JEE Main level
A Buna-S sample has 3 butadiene units (-[CH2-CH=CH-CH2]-) for every 1 styrene unit (-[CH2-CH(C6H5)]-) in the chain. Taking C = 12, H = 1, the mass percent of st... JEE Advanced level
Neoprene is the polymer of 2-chlorobuta-1,3-diene, CH2=C(Cl)-CH=CH2, formed by 1,4-addition. Taking C = 12, H = 1, Cl = 35.5, the mass percent of chlorine in ne... JEE Advanced level
The monomer of natural rubber is NEET level
The first step of initiation by benzoyl peroxide, C6H5COO-OOCC6H5, in an addition polymerisation is JEE Main level
Orlon (polyacrylonitrile) is obtained by addition polymerisation of NEET level
Which one of the following is a free radical initiator for addition polymerisation? NEET level
Polypropene is prepared with a Ziegler-Natta catalyst. In the isotactic form, with the main chain drawn in a planar zigzag, JEE Advanced level
Two growing polystyrene radicals, of 400 and 600 monomer units, terminate (ignore initiator fragments). Which outcome is correct? JEE Main level
Which of the following statements about the free radical polymerisation of ethene to low density polyethene is/are correct? (One or more options may be correct.... JEE Advanced level
The monomer used to prepare polyvinyl chloride (PVC) is NEET level
During propagation in the free radical polymerisation of CH2=CH-Cl, the growing radical attacks mainly the CH2 carbon of the monomer because JEE Main level
In a free radical polymerisation, adding a chain transfer agent such as CCl4 while all other conditions are kept the same will, in general, cause the average ch... JEE Main level
A copolymer chain contains acrylonitrile (CH2=CH-CN) and buta-1,3-diene (CH2=CH-CH=CH2) units in the mole ratio 1 : 2 (end groups ignored; C 12, H 1, N 14). The... JEE Advanced level
Two polystyryl radicals, each ending in -CH2-CH(C6H5) with the unpaired electron on the carbon bearing the phenyl group, terminate by disproportionation. The pr... JEE Advanced level
Which of the following monomer and mode-of-polymerisation pairings is/are suitable? (One or more options may be correct.) JEE Advanced level
Which of the following is commonly used as a free radical initiator for the addition polymerisation of ethene at high pressure? NEET level
For an ideal free radical polymerisation without chain transfer at fixed temperature and monomer concentration, the initiator concentration is increased. Take t... JEE Advanced level
Which of the following pairs of conditions and polymer is correct? JEE Main level
A polymer sample contains three fractions: 120 chains of molar mass 15000 g/mol, 200 chains of 40000 g/mol and 80 chains of 90000 g/mol. Using M_n=sum N_iM_i/su... JEE Advanced level
Which monomer is best suited to anionic polymerisation initiated by NaNH2 in liquid ammonia? JEE Main level
Teflon is obtained by the addition polymerisation of NEET level
Which of the following is/are formed by addition polymerisation of a single monomer? (One or more options may be correct.) JEE Advanced level
Which monomer is best suited to cationic polymerisation with BF3 and a trace of water? JEE Main level
Two growing polystyryl radicals with 300 and 500 styrene units respectively (ignore initiator fragments) terminate by combination. The number of styrene units i... JEE Main level
Which one of the following is an addition (chain growth) polymer? NEET level
In the initiation of free radical polymerisation by benzoyl peroxide, the first step is JEE Main level