(H2 SO4)/( Heat ) number of product ( .x) Br2 / CC4⟶ number of products (y). The (x) and (y) are

step 1 Question is alcohol is reacting with the H2S4 number of products X. This product X is reacting w

(H2 SO4)/( Heat ) number of product ( .x) Br2 / CC4⟶ number...

$\frac{\mathrm{H}_{2} \mathrm{SO}_{4}}{\text { Heat }}$ number of product ( $\left.\mathrm{x}\right) \stackrel{\mathrm{Br}_{2} / \mathrm{CC}_{4}}{\longrightarrow}$ number of products (y). The $(\mathrm{x})$ and $(\mathrm{y})$ are respectively (a) ii, 4 (b) $\mathrm{ii}, 3$ (c) iii, 6 (d) iii, 5

$\frac{\mathrm{H}_{2} \mathrm{SO}_{4}}{\text { Heat }}$ number of product ( $\left.\mathrm{x}\right) \stackrel{\mathrm{Br}_{2} / \mathrm{CC}_{4}}{\longrightarrow}$ number of products (y).
The $(\mathrm{x})$ and $(\mathrm{y})$ are respectively
(a) ii, 4
(b) $\mathrm{ii}, 3$
(c) iii, 6
(d) iii, 5

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Key Concepts

Electrophilic Addition Reactions

Electrophilic addition reactions involve the attack of an electron-rich alkene by an electrophile, such as a halogen molecule. This reaction commonly proceeds via the formation of a cyclic halonium ion intermediate, followed by nucleophilic attack by a halide ion. The approach of the nucleophile leads to anti addition stereochemistry, which can produce stereoisomeric dibromo products when starting from different alkene isomers.

Alkene Isomerism and Regioselectivity

Because dehydration can lead to different positional and stereoisomers of alkenes, a thorough understanding of alkene isomerism is essential. The regiochemistry of deprotonation steps and the possibility of forming geometrical (cis/trans, or E/Z) isomers account for the number of products observed, as more than one distinct alkene may be thermodynamically or kinetically favored.

Acid?Catalyzed Dehydration

Acid?catalyzed dehydration involves the removal of water from an alcohol molecule under strongly acidic conditions and heat to form alkenes. The process typically proceeds via an E1 or E2 mechanism, and when the alcohol structure allows more than one deprotonation possibility, a mixture of alkene isomers may be produced. Key factors such as carbocation stability and Zaitsev’s rule guide the regioselectivity of the elimination.

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