Question

In each reaction box, place the best reagent or reactant from the list below. Reagents may be used more than once or not at all. Draw the intermediate products B and C (both are neutral; omit byproducts).

Answer 1

Concepts and reason

One or more substances that react together to form a product is called a chemical reaction. Most chemical reactions occurs with the help of reagents.

Reagents are the substances used to transform one form of substance to another. The reaction undergoes series of steps

Deprotonation of alkyne, substitution and hydrogenation reaction to attain a final product.

Fundamentals

The reagents play a vital role in a reaction to occur. Each reagent plays a different role in the chemical reaction.

Deprotonation of alkynes: Alkyne undergoes Deprotonation with the help of a reagent sodium amide $\left( {{\rm{NaN}}{{\rm{H}}_{\rm{2}}}} \right)$ . Acetylide ion forms when Sodium amide is reacted with alkyne. Acetylide ion acts as good nucleophile in which it undergoes substitution reaction with alkyl halides and forms a new carbon chain.

Substitution: The Nucleophilic substitution reaction $\left( {{{\rm{S}}_{\rm{N}}}{\rm{2}}} \right)$ occurs when the nucleophile undergoes a reaction with alkyl halides.

Hydrogenation: The addition of ${{\rm{H}}_{\rm{2}}}$ in the presence of palladium is used to reduce alkenes and alkynes to alkanes.

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