(H3 C)2 C=CHCH3+NOBr ⟶ A The structure of the product (a)is given as (a) (CH3)2 C(Br)-CH(NO) CH3

step 1 Question is when Alkin is reacting with the NOBR, then what compound we can get? Anobir is the n

(H3 C)2 C=CHCH3+NOBr ⟶ A The structure of the product (a)is...

$$ \left(\mathrm{H}_3 \mathrm{C}\right)_2 \mathrm{C}=\mathrm{CHCH}_3+\mathrm{NOBr} \longrightarrow \mathrm{~A} $$ The structure of the product (a)is given as (a) $\left(\mathrm{CH}_3\right)_2 \mathrm{C}(\mathrm{Br})-\mathrm{CH}(\mathrm{NO}) \mathrm{CH}_3$ (b) $\left(\mathrm{CH}_3\right)_2 \mathrm{C}(\mathrm{NO})-\mathrm{CH}(\mathrm{Br}) \mathrm{CH}_3$ (c)-(d) Compound can't copy

$$
\left(\mathrm{H}_3 \mathrm{C}\right)_2 \mathrm{C}=\mathrm{CHCH}_3+\mathrm{NOBr} \longrightarrow \mathrm{~A}
$$

The structure of the product (a)is given as
(a) $\left(\mathrm{CH}_3\right)_2 \mathrm{C}(\mathrm{Br})-\mathrm{CH}(\mathrm{NO}) \mathrm{CH}_3$
(b) $\left(\mathrm{CH}_3\right)_2 \mathrm{C}(\mathrm{NO})-\mathrm{CH}(\mathrm{Br}) \mathrm{CH}_3$
(c)-(d) Compound can't copy

Key Concepts

Regioselectivity in Nucleophilic Attack on Halonium Ions

The nucleophile tends to attack the more substituted carbon in a halonium ion intermediate due to its higher degree of positive character, which arises from the stabilization of positive charge by adjacent alkyl groups. This selective attack determines the orientation of the added substituents in the final product.

Markovnikov's Rule

Markovnikov’s rule predicts the regiochemistry of electrophilic addition to unsymmetrical alkenes. It states that in such additions, the electrophile adds to the carbon with more hydrogen substituents, leading to the formation of the more stable intermediate (carbocationic or bridged) and thereby influencing the final product distribution.

Electrophilic Addition to Alkenes

This is a fundamental reaction mechanism where an electrophile adds to the carbon–carbon double bond of an alkene. The process involves the initial formation of a positively charged intermediate (or bridged intermediate) which is then attacked by a nucleophile, ultimately converting the ? bond into two new ? bonds.

Halonium Ion Intermediate

In many electrophilic additions, especially with halogen-containing reagents, the reaction proceeds through the formation of a cyclic halonium ion intermediate. This three?membered ring structure, where the halogen is bound to both carbons of the original double bond, is key to understanding the subsequent regioselective nucleophilic attack.

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