Please help me resolve it with full explanation and suggest which theory should

Question

Please help me resolve it with full explanation and suggest which theory should be used to consider it. Appreciate in advance
Quesiton: For which of these reactions do you expect a decrease in (more negative) entropy? a) 1,2-hydride shift in the sec-pentyl cation b) substitution of cyclopentyl chloride with KI c) elimination of H2O from tert-butyl alcohol d) addition of H2 to cis-2-butene
Please help me resolve it with full explanation and suggest which theory should be used to consider it. Appreciate in advance
Quesiton: For which of these reactions do you expect a decrease in (more negative) entropy? a) 1,2-hydride shift in the sec-pentyl cation b) substitution of cyclopentyl chloride with KI c) elimination of H2O from tert-butyl alcohol d) addition of H2 to cis-2-butene
Please help me resolve it with full explanation and suggest which theory should be used to consider it. Appreciate in advance
Quesiton: For which of these reactions do you expect a decrease in (more negative) entropy? a) 1,2-hydride shift in the sec-pentyl cation b) substitution of cyclopentyl chloride with KI c) elimination of H2O from tert-butyl alcohol d) addition of H2 to cis-2-butene

Explanation / Answer

Entropy is the measure of disorder or randomness.

With increasing of no molecules after the reaction, entropy increases while decrease with decreasing no of molecules.

Among the given option D, two molecules (alkene, Hydrogen) gets converted into one molecule (alkane).

So entropy is negative

While in Option A, there is no change in entropy since one molecule converting into another by rearrangement

Option B, no change in entropy, since same no of molecules before and after the reaction

In C, entropy increasing, since alkene and H2O are formed after the reaction, no of molecules increased.

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