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Dehydrohalogenation of Dihalides

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How are the products of the following two reactions related? 1. Reaction of 1-Phenylbut-1-yne with dil. H2SO4 and Hg(2+) 2. Reaction of 1-Phenylbut-1-yne with (i) BH3 +THF (ii) H2O2 + OH(-) . Give the mechanism of the reactions too.

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Predict the products of the reaction of hex-2-yne with the following.

1. 2 equivalents of $B r_{2}$
2. equivalent of $H B r$
3. Excess $H B r$
4. $L i i n N H_{3}$
5. $H_{2} O, H g S O_{4}, H_{2} S O_{4}$
In how many of these reactions, do we get a mixture of products?

Q. Give the products formed from the reactions of each of the following compounds with Hex -3-yne:
(i)

K M n O_{4}

in warm acid
(ii)

O_{3} / H_{2} O

Q. Which is main product in the reaction of but 1 - yne with an excess of hydrogen chloride?

Q. Predict the product C obtained in the following reaction of but-1-yne.

C H_{3} C H_{2} - C \equiv C H + H C l \to B H I - - \to C

Q. Consider following reactions and write total number of reactions which can produce

1^{\circ}

alcohol as one of the product.

1) E t - C O O H i . B H_{3} - ------ \to i i . H^{+} / H_{2} O

2) (C H_{3})_{2} C H - C O O H N a B H_{4} - --- \to

3) E t - C O O C H_{3} H^{+} / H_{2} O - ---- \to

4) (C H_{3})_{2} C = C H_{2} i . B H_{3}, T H F - -------- \to i i . H_{2} O_{2}, O H^{-}

5) E t - C O C l H_{2} - ------ \to P d - B a S O_{4}

6) (C H_{3})_{2} C H - O - E t H^{+} / H_{2} O - ---- \to

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Dehydrohalogenation of Dihalides

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