Question

4. Якісною реакцією на ненасичені вуглеводні є взаємодія... А з киснем та бромною водою; Б з воднем та розчином калiй перманганату; В з бромною водою та розчином калiй перманганату; Г iз хлором (за умови освітлення) та бромною водою. ​

Answer 1

Відповідь:

Б з воднем та розчином калiй перманганату

Пояснення:

Взаємодія ненасичених вуглеводнів з бромною водою та розчином калій перманганату є якісною реакцією. Тому правильна відповідь: В з бромною водою та розчином калiй перманганату.

Answer 2

Правильна відповідь А з киснем та бромною водою

Answer 3

Qualitative Reaction to Unsaturated Hydrocarbons

A qualitative reaction is a chemical reaction that helps identify or characterize a substance based on its reaction with other chemicals. In the case of unsaturated hydrocarbons, there are several reactions that can be used to identify or characterize them. Let's explore the options provided in the question:

A. Reaction with Oxygen and Bromine Water Unsaturated hydrocarbons can react with oxygen and bromine water. This reaction is known as the bromine test or the addition reaction. Unsaturated hydrocarbons decolorize bromine water, turning it from orange to colorless. This is because the double or triple bonds in unsaturated hydrocarbons break, allowing bromine to add across the carbon-carbon double or triple bond. The reaction can be represented as follows:

Unsaturated hydrocarbon + Bromine water → Saturated hydrocarbon + Colorless solution

B. Reaction with Hydrogen and Potassium Permanganate Solution Unsaturated hydrocarbons can also react with hydrogen and potassium permanganate solution. This reaction is known as the hydrogenation reaction. Unsaturated hydrocarbons react with hydrogen in the presence of a catalyst, such as palladium or platinum, to form saturated hydrocarbons. The reaction can be represented as follows:

Unsaturated hydrocarbon + Hydrogen + Catalyst → Saturated hydrocarbon

C. Reaction with Bromine Water and Potassium Permanganate Solution The reaction between unsaturated hydrocarbons, bromine water, and potassium permanganate solution is not a commonly used reaction to identify or characterize unsaturated hydrocarbons. Therefore, it is not a typical qualitative reaction for unsaturated hydrocarbons.

D. Reaction with Chlorine (under light) and Bromine Water Unsaturated hydrocarbons can react with chlorine (under light) and bromine water. This reaction is known as the addition reaction. Unsaturated hydrocarbons decolorize bromine water, similar to the reaction with oxygen and bromine water. However, the reaction with chlorine requires the presence of light. The reaction can be represented as follows:

Unsaturated hydrocarbon + Chlorine (under light) → Saturated hydrocarbon + Colorless solution

Based on the provided options, the correct answer would be D. Reaction with Chlorine (under light) and Bromine Water as a qualitative reaction to unsaturated hydrocarbons.

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