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Chemical Properties of Alcohol

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give the chemical reaction between iodine solution and starch using symbols and formula

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Solution

$S t a r c h o n r e a c t i o n w i t h i o d i n e f o r m s a d a r k b l u e c o m p l e x . A s i o d i n e i s i n s o l u b l e i n w a t e r, i n t h e p r e s e n c e o f i o d i d e, i o d i n e f i r s t f o r m s t r i i o d i d e . T h i s t r i i o d i d e t h e n r e a c t s w i t h s t a r c h (w h i c h i s a p o l y m e r o f α - D g l u \cos e u n i t s) I_{2} + I^{-} \to {I_{3}}^{-} {I_{3}}^{-} + (C_{6} H_{12} O_{6})_{n} \to (C_{6} H_{12} O_{6})_{n} {I_{3}}^{-}$

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