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Which of the ...

Question

Which of the following represents chloroprene, the monomer of neoprene?

C H_{2} = C H - C H = C H_{2} C l

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C H_{2} = C | C H_{3} - C H = C H C l

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C H_{2} = C | C l - C H = C H_{2}

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C H_{2} = C | C H_{3} - C | C l = C H_{2}

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Solution

The correct option is B $C H_{2} = C | C l - C H = C H_{2}$
The monomer of neoprene (synthetic rubber) is chloroprene. Neoprene or polychloroprene is formed by the free radical polymerisation of chloroprene. It has superior resistance to vegetable and mineral oils. It is used for manufacturing conveyor belts, gaskets, and hoses.
$n C H_{2} = C l | C - C H = C H_{2} C h l o r o p r e n e 2 - C h l o r o - 1, 3 - b u t a d i e n e P o l y m e r i s a t i o n - -------- \to [- C H_{3} - C l | C = C H - C H_{2} -]_{n} N e o p r e n e$

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C H_{3} - C H_{2} - C H_{2} - C l a n d C H_{3} - C H_{2} - C H_{2} - B r

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C H_{3} - C H_{2} - C H_{2} - B r ∣ C H - C H_{3} a n d C H_{3} - C H_{3} ∣ C H - C H_{2} - B r ∣ C H - C H_{3}

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c o n c . H C l :

(a) C H_{3} - C H_{2} - O H A n h y Z n C l_{2} / △ - -------- \to C H_{3} - C H_{2} - C l

(b) C H_{3} - C H_{3} | C | C H_{3} - C H_{2} O H A n h y Z n C l_{2} / △ - -------- \to C H_{3} - C H_{1} | C | C H_{3} - C H_{2} - C H_{3}

(c) C H_{3} - O H | C | C H_{3} - C H_{3} A n h y Z n C l_{2} / △ - -------- \to C H_{3} - C l | C | C H_{3} - C H_{3}

(d) C H_{2} = C H - C H_{2} - O H A n h y Z n C l_{2} / △ - -------- \to C H_{2} = C H - C H_{2} - C l

A . C H_{3} - C H = C H_{2} + H C l ⟶ C H_{3} - C | C l H - C H_{3}

B . C H_{3} - C H = C H_{2} + H B r ⟶ C H_{3} - C H_{2} - C H_{2} B r

C . C H_{3} - C H = C H_{2} + H B r p e r o x i d e - ---- \to C H_{3} - C H_{2} - C H_{2} - B r

D . C H_{3} - C H = C H_{2} + H I p e r o x i d e - ---- \to C H_{3} - C | I H - C H_{3}

A g N O_{3}

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