Give the major product that forms when (Z)-3-...

Give the major product that forms when $(Z)-3-$ methylpent-2-ene reacts with each of the following reagents: (a) $\mathrm{HI} ;$ (b) $\mathrm{H}_{2}$ in the presence of a platinum catalyst; (c) $\mathrm{H}_{2} \mathrm{O}$ in $\mathrm{H}_{2} \mathrm{SO}_{4} ;$ (d) $\mathrm{Br}_{2}$ in $\mathrm{CCl}_{4}$.

Key Concepts

Electrophilic Addition Reactions

These reactions involve the addition of electrophiles to the carbon–carbon double bond of alkenes, forming new sigma bonds. They typically proceed through the formation of a carbocation intermediate or a cyclic halonium ion, and are fundamental to many organic synthesis processes.

Markovnikov's Rule

This rule predicts the regioselectivity in electrophilic addition reactions, stating that in reactions with unsymmetrical reagents, the electrophile (or the proton in acid-catalyzed reactions) attaches to the less substituted carbon, leading to the formation of the more stable, more substituted carbocation intermediate.

Catalytic Hydrogenation

In this reaction, hydrogen (H?) is added across a double bond in the presence of a metal catalyst such as platinum, palladium, or nickel. The process converts the unsaturated alkene to a saturated alkane, typically via a syn addition mechanism where both hydrogen atoms add to the same face of the double bond.

Halogen Addition and Anti Addition

The addition of diatomic halogens (like Br?) to alkenes in an inert solvent occurs via the formation of a cyclic halonium ion intermediate. This mechanism forces the nucleophile (the halide ion) to attack from the side opposite to the halonium ion, resulting in anti addition, where the two halogen atoms add to opposite sides of the double bond.

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