The copolymer formed by addition polymerization of styrene and acrylonitrile in the presence of peroxide is :
Show Hint
The Correct Option is D
Solution and Explanation
Peroxide starts free-radical addition: each monomer adds through its C=C, so every monomer contributes one CH2 and one CH(substituent) to the carbon backbone, normally head-to-tail.
The copolymer (SAN) therefore has the repeating unit \(-\mathrm{CH_2-CH(C_6H_5)-CH_2-CH(CN)}-\).
Option (1) has CH(C6H5) and CH(CN) adjacent (head-to-head), option (2) contains a CH3 and a quaternary carbon (impossible from these monomers), option (3) has two CH2 groups adjacent, which is not the head-to-tail pattern, while option (4) shows \(-\mathrm{CH_2-CH(C_6H_5)-CH_2-CH(CN)}-\).
Answer: (4)
Top JEE Main Chemistry Questions
What will be the equilibrium constant of the given reaction carried out in a \(5 \,L\) vessel and having equilibrium amounts of \(A_2\) and \(A\) as \(0.5\) mole and \(2 \times 10^{-6}\) mole respectively?
The reaction : \(A_2 \rightleftharpoons 2A\)- At equilibrium the concentrations of and in a sealed vessel at . What will be for the reaction
- Find out the major products from the following reactions
Cobalt chloride when dissolved in water forms pink colored complex $X$ which has octahedral geometry. This solution on treating with cone $HCl$ forms deep blue complex, $\underline{Y}$ which has a $\underline{Z}$ geometry $X, Y$ and $Z$, respectively, are
- The correct order of atomic radii is:
Top JEE Main Polymers Questions
Match List I with List II :
List-I Polymer List-II used for items A Nylon 6,6 I Buckets B Low density polythene II Non-stick utensils C High density polythene III Bristles of brushes D Teflon IV Toys - Polymer which is named as orlon is:
- Caprolactam when heated at high temperature in presence of water, gives
- Poly-$\beta$-hydroxybutyrate-co-$\beta$ hydroxyvalerate (PHBV) is a copolymer of___.
- Match List I with List II
List I (polymer) List-II (Nature) A. 
I. Thermosetting polymerB. 
II. FibersC. 
III. ElastomerD. 
IV. Thermoplastic polymer Choose the correct answer from the options given below:
Top JEE Main Questions
- Two masses $m$ and $\frac{m}{2}$ are connected at the two ends of a massless rigid rod of length $l$. The rod is suspended by a thin wire of torsional constant $k$ at the centre of mass of the rod-mass system(see figure). Because of torsional constant $k$, the restoring torque is $\tau =k\theta$ for angular displacement $\theta$. If the rod is rota ted by $\theta_0$ and released, the tension in it when it passes through its mean position will be:
What will be the equilibrium constant of the given reaction carried out in a \(5 \,L\) vessel and having equilibrium amounts of \(A_2\) and \(A\) as \(0.5\) mole and \(2 \times 10^{-6}\) mole respectively?
The reaction : \(A_2 \rightleftharpoons 2A\)- The value of is
- The number of terms of an is even. The sum of the odd terms is and of the even terms is . The last term exceeds the first by . Then the number of terms in the series is ______.
A black body is at a temperature of 2880 K. The energy of radiation emitted by this body with wavelength between 499 nm and 500 nm is U1, between 999 nm and 1000 nm is U2 and between 1499 nm and 1500 nm is U3. The Wien's constant, b = 2.88×106 nm-K. Then,