Question

Identify the following reactions as additions, eliminations, substitutions, or rearrangements: a) Pd catalyst H, OH b) 2000 c C) CH3CH_2Br NaCN CH3CH_2CN NaBr

a) True
b) False

Answer 1

The question focuses on classifying chemical reactions into types such as addition, substitution, etc. The Pd catalyst H, OH reaction lacks context, and 2000 °C cannot be classified without additional information. The reaction between CH3CH2Br and NaCN is a nucleophilic substitution.

Step-by-step explanation:

To address the student's question, we need to classify the types of chemical reactions based on the given information. We'll do this by looking at the reagents and conditions mentioned:

• Addition reactions involve the combination of two or more substances to form a single product. For example, passing hydrogen (H2) over a compound in the presence of a nickel catalyst, as seen in the hydrogenation of an alkene, results in the addition of hydrogen across the double bond.
• Substitution reactions involve the exchange of one functional group for another. For instance, when 2-bromoethane (CH3CH2Br) reacts with sodium cyanide (NaCN), the bromine is substituted by the cyanide group to form ethanenitrile (CH3CH2CN).

As for the specific reactions in the question:

1. The reaction involving Pd catalyst H, OH is missing enough context to categorize it accurately.
2. The reaction implied by 2000 ℃ gives no substances to consider, so it cannot be classified meaningfully.
3. The reaction where CH3CH2Br and NaCN react to form CH3CH2CN and NaBr is a nucleophilic substitution reaction, as the bromine atom is substituted by the cyanide ion.