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Standard XII

Chemistry

Addition of Halogen Acid for Alkynes

The reagents ...

Question

The reagents required for the following two step transformation are

(i) HBr, benzoyl peroxide ; (ii)

C H_{3} C N

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(i) HBr ; (ii) NaCN

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(i)

B r_{2}

; (ii) NaCN

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(i) NaBr ; (ii) NaCN

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Solution

The correct option is B (i) HBr ; (ii) NaCN

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Similar questions

Q. Complete the following chemical reactions and write the products.
(i)

C H_{3} - C H_{2} - C l + K O H (a l c .) \to

(ii)

R - C H = C H_{2} + H B r P e r o x i d e - ---- \to

Q. To convert

1 -

butyne to

1 - D -

butanal, one would carry out the following steps :
(I) Sodium amide, then

D_{2} O

(II) Disiamy Iborane, then hydrogen peroxide/sodium hydroxide
(III) The transformation can not be carried out with the indicated reagents.

Mark the correct increasing order of reactivity of the following compounds with HBr / HCl.

(a) I < II < III
(b) II < I < III
(c) II < III < I
(d) III < II < I

Q. Consider the reactions
(i)

(C H_{3})_{2} C H - C H_{2} B r

C_{2} H_{3} O H - ---- \to (C H_{3})_{2} C H - C H_{2} O C_{2} H_{5} + H B r

(ii)

(C H_{3})_{2} C H - C H_{2} B r

C_{2} H_{3} O^{-} - ---- \to (C H_{3})_{2} C H - C H_{2} O C_{2} H_{5} + H B r

The mechanisms of reactions(i) and (ii) are respectively.

Q. Consider the following reactions:

(i)

{(C H_{3})}_{2} C H - C H_{2} B r C_{2} H_{5} O H - ------------ \to {(C H_{3})}_{2} C H - C H_{2} O C_{2} H_{5} + H B r

(ii)

{(C H_{3})}_{2} C H - C H_{2} B r C_{2} H_{5} O^{-} - ------------ \to {(C H_{3})}_{2} C H - C H_{2} O C_{2} H_{5} + {B r}^{-}

The mechanism of reactions (i) and (ii) are respectively:

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