The mechanism for the reaction of 2-butyne with one equivalent of bromine should be given. Concept Introduction: Addition of halides to alkynes : Halogens like chlorine and bromine adds to the alkyne compounds. The general form of the reaction is given below. If excess halides are present, a second addition reaction also occurs.

Question

Using the conditions of spontaneity to deduce the signs of AH and AS Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy AS. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction observations conclusions A This reaction is always spontaneous, but proceeds slower at temperatures above 120. °C. ΔΗ is (pick one) AS is (pick one) ΔΗ is (pick one) B This reaction is spontaneous except above 117. °C. AS is (pick one) ΔΗ is (pick one) This reaction is slower below 20. °C than C above. AS is |(pick one) ? 18 Ar 1

Answer 1

Question

Chapter 7.6, Problem 13P

(a)

Interpretation Introduction

Interpretation:

The mechanism for the reaction of 2-butyne with one equivalent of bromine should be given.

Concept Introduction:

Addition of halides to alkynes: Halogens like chlorine and bromine adds to the alkyne compounds. The general form of the reaction is given below.

If excess halides are present, a second addition reaction also occurs.

(b)

Interpretation Introduction

Interpretation:

The configuration of the product obtained in the above reaction should be identified.

Concept Introduction:

Addition of halides to alkynes: Halogens like chlorine and bromine adds to the alkyne compounds. The general form of the reaction is given below.

If excess halides are present, a second addition reaction also occurs.

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