Question

The position of \(-\mathrm{Br}\) in the compound in \(\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHC}(\mathrm{Br})\left(\mathrm{CH}_{3}\right)_{2}\) can be classified as (A) Allyl (B) Aryl (C) Vinyl (D) Secondary

Short answer

The position of the Br atom in the compound CH₃CH=CHC(Br)(CH₃)₂ can be classified as \( \boxed{(C) \text{ Vinyl}} \).

Step-by-step solution

Identify the structure of the compound

First, write down the structure of the given compound, CH₃CH=CHC(Br)(CH₃)₂, as shown: H H | | CH₃-C=CH-C(Br)(CH₃)₂

Analyze the position of the Br atom in the compound

The Br atom is attached to the tetrahedral carbon atom, which is attached to a double bond.

Evaluate the given options based on the position of the Br atom

(A) Allyl: An allyl group is a chemical functional group derived from allyl alcohol that has its general formula R-CH₂-CH=CH₂, where R is any functional group. In this case, the bromine atom is not present in such a group. (B) Aryl: An aryl group refers to a functional group derived from an aromatic compound made up of alternating single and double bonds in a closed ring structure. As there is no ring structure in this compound, the position of the bromine atom cannot be classified as aryl. (C) Vinyl: A vinyl group refers to the functional group with the formula R-CH=CH₂, where R is an alkyl chain or another functional group. In the given compound, the Br atom is attached to a carbon adjacent to a carbon-carbon double bond. Therefore, the position of the Br atom can be classified as vinyl. (D) Secondary: A secondary position is when an atom is bonded to two other carbon atoms. In this case, the carbon atom bearing the Br atom is bonded to three carbon atoms, so the Br atom cannot be classified as secondary. Thus, the position of the Br atom in the compound CH₃CH=CHC(Br)(CH₃)₂ can be classified as: \( \boxed{(C) \text{ Vinyl}} \)

Key concepts

Functional Groups

Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. These groups play a crucial role in organic chemistry because they determine how a molecule interacts with other substances.

A functional group typically consists of a few atoms (like hydroxyl, -OH; methyl, -CH₃; carboxyl, -COOH) and can determine the overall polarity and reactivity of the compound.

• Alcohol (-OH)
• Carboxylic acid (-COOH)
• Aldehyde (-CHO)

Understanding functional groups helps chemists predict how a molecule will react. This foreknowledge is essential for designing chemical reactions and understanding the synthesis and degradation pathways in organic chemistry.

Vinyl Group

As part of understanding organic structures, recognizing a vinyl group is key. The vinyl group is a simple functional group with the structure \(\text{R-CH=CH}_2\), where \( R \) represents the rest of the molecule. It is particularly notable because it includes a carbon-carbon double bond.

This configuration gives the vinyl group certain reactive properties:

• The presence of the double bond means that the vinyl group can undergo addition reactions, which are pivotal in forming polymers like polyvinyl chloride (PVC).
• It makes vinyl compounds slightly more reactive than similar saturated compounds, enabling further chemical conversions.
• This double bond position also influences the naming and classification in organic nomenclature, as seen with bromine attached in the problem given.

Recognizing when an atom is part of a vinyl group, as in the case of the \(\text{Br}\) in the compound, aids in categorizing compounds accurately and predicting their behavior during reactions.

Organic Structure Analysis

Analyzing organic structures involves understanding how atoms are arranged and the types of bonds that form between them. This skill is fundamental to identifying different functional groups and predicting molecular behavior.

Consider the given compound: \(\text{CH}_3\text{CH}=\text{CHC}( ext{Br})(\text{CH}_3)_2\). Analysis includes:

• Identifying the carbon skeleton of the molecule.
• Seeing how functional groups, like the vinyl group with double bonds, are arranged relative to each other.
• Spotting branching chains, and where different atoms or groups like bromine are attached.

Such detailed analysis helps chemists deduce the chemical properties and reactivity of the molecule. It also supports determining correct IUPAC names and understanding which parts of the molecule contribute to specific reactivity patterns, crucial for practical applications in lab settings and industrial processes.