Please answe questions 1-5 Which of the following reactions is not an addition r

Question

Please answe questions 1-5 Which of the following reactions is not an addition reaction? hydration of alkenes dehydrohalogenation bromination of alkenes reaction of alkenes with HCI Which statement is not true regarding oxymercuration-demercuration of an alkene? An alcohol product is produced The reagents for oxymercuration are mercuric acetate and water The net reaction follows Markovnikov's rule in the old statement of the rule Only an OH group is added to the alkene during the reaction In an addition reaction of an alkene which type of bond is cleaved in the alkene? sp bond only sigma bond only both a sigma bond and a pi bond pi bond only The intermediate produced in the rate-determining step of a reaction of an alkene with a hydrogen halide is alkyloxonium ion carbanion halide ion carbocation Alkene + cold concentrated H_2SO_4 rightarrow The reaction above produces which product? carboxylic acid alcohol alkylhydrogen sulfate alkane

Explanation / Answer

1. The correct option is b. Dehydrohalogenation

Dehydrohalogenation is not a addition reaction. It is a elimination reaction. Elimination of HX takes place from alkyl halide.

All other reactions are addition reactions.

2. The correct option is d. Only OH group is added to the alkene during the reaction.

This statement is not true as both both OH and H groups are added to the alkene in the reaction.

3. The correct option is d. pi bond only

Double bond of alkene consist of one sigma bond and one pi bond. During addition reaction only pi bond breaks and sigma bond remains intact

4. The correct option is d. carbocation

Carbocation is carbon with positive charge. Carbocation intermediate forms in the rate determining step when halide part of alkyl halide attacks the alkene.

5. The correct option is c. alkyl hydrogensulphate

Alkenes react with concentrated sulphuric acid in the cold to produce alkyl hydrogensulphates.

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