Compound that is least likely to undergo S N 1 reaction with ethanol has to be identified among the given compounds. Concept Introduction: S N 1 Reaction: It is a nucleophilic substitution reaction in which the rate determining step depends on one reactant. First step is the formation of more stable carbocation which is followed by the attack of nucleophile. Formation of more stable carbocation and the leaving group present in the substrate plays very important role in the reactivity of S N 1 reaction. The increasing stability order of carbocation is as follows, Primary carbocation < secondary carbocation < tertiary carbocation Carbocation: it is carbon ion that bears a positive charge on it. Huckel’s rule states that based on the number of pi electrons planar, monocyclic, and conjugated polyene compounds can be classified as aromatic or anti-aromatic. a) The number of π electrons in a cyclic conjugated system is 4 n where n is an integer then it is anti-aromatic. b) The number of π electrons in a cyclic conjugated system is ( 4 n + 2 ) where n is an integer then it is aromatic. Aromatic compounds are more stable than non-aromatic compound.

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Chapter 17, Problem 68IP

Interpretation Introduction

Interpretation: Compound that is least likely to undergo SN1 reaction with ethanol has to be identified among the given compounds.

Concept Introduction:

SN1Reaction: It is a nucleophilic substitution reaction in which the rate determining step depends on one reactant. First step is the formation of more stable carbocation which is followed by the attack of nucleophile. Formation of more stable carbocation and the leaving group present in the substrate plays very important role in the reactivity of SN1 reaction.

The increasing stability order of carbocation is as follows,

Primary carbocation < secondary carbocation < tertiary carbocation

Carbocation: it is carbon ion that bears a positive charge on it.

Huckel’s rule states that based on the number of pi electrons planar, monocyclic, and conjugated polyene compounds can be classified as aromatic or anti-aromatic.

a) The number of π electrons in a cyclic conjugated system is 4n where n is an integer then it is anti-aromatic.

b) The number of π electrons in a cyclic conjugated system is (4n+2) where n is an integer then it is aromatic.

Aromatic compounds are more stable than non-aromatic compound.

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