JEE Main 2014 · 9 Apr · Shift 1 · Chemistry Q58

ChemistrySingle correct+4 / -1Question 58 of 90

Structure of some important polymers are given. Which one represents Buna-S ?

\ce{(-CH2-C(CH3)=CH-CH2-)_n}

\ce{(-CH2-CH=CH-CH2-CH(C6H5)-CH2-)_n}

\ce{(-CH2-CH=CH-CH2-CH(CN)-CH2-)_n}

\ce{(-CH2-CCl=CH-CH2-)_n}

Answer and worked solution

Official answer: B

Buna-S is the copolymer of 1,3-butadiene and styrene:
$\ce{(-CH2-CH=CH-CH2-CH(C6H5)-CH2-)_n}.$

JEE Main 2014 · 9 Apr · Shift 1, Chemistry question 58