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Isomerisation of Alkynes

34. If 1,3-di...

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34. If 1,3-dibromopropane reacts with zinc and NaI the product formed will be (1) propene (2) propane (3) cyclopropane (4) hexane

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Q. If 1, 3 - dibromo propane reacts with zinc and NaI the product obtained is

1, 3

- Dibromopropane reacts with metallic zinc to form:

Q. Consider the following two reactions:
(i) Propene +

H_{2} \to

Δ H_{1}

(ii) Cyclopropane +

H_{2} \to

Δ H_{2}

| Δ H_{2}

Δ H_{1} |

Q. Consider the following two reactions:
(i)

P r o p e n e + H_{2} ⟶ p r o p a n e; {Δ H}_{1}

C y c l o p r o p a n e + H_{2} ⟶ P o r p a n e; {Δ H}_{2}

{Δ H}_{2} - {Δ H}_{1}

Cyclopropane rearranges to form propene:

△ \to C H_{2} - C H = C H_{2}

This follows first-order kinetics. The rate constant is

2.714 \times 10^{- 3} s e c^{- 1}

. The initial concentration of cyclopropane is

0.29 M

. What will be the concentration of cyclopropane after

100 s e c

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