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Predict the major products of dehydration catalyzed by sulfuric acid.

(a) heptan-1-ol

(b) heptan-2-ol

(c) pentan-2-ol

(d) 1-methylcyclohexanol

(e) Cyclohexylmethanol

(f) 2-methylcyclohexanol

Short Answer

Expert verified

(a)

(b)

(c)

(d)

(e)

(f)

Step by step solution

01

(a): Dehydration

A dehydration reaction is carried out in the chemical reaction if an organic compound loses a water molecule to form an alkene.This is carried out by heating alcohol at high temperatures in the existence of strong acid.

02

Reaction

Whenheptan-1-ol is treated with sulfuric acid to form hexan-2-ene.

Formation of hexan-2-ene

03

(b): Heptan-2-ol

Heptan-2-ol is colourless alcohol with a mild odour. It consists of seven carbon atoms, and the second carbon hydroxyl group is attached that’s why it is said to be secondary alcohol.

04

Reaction

When heptan-2-ol is treated with sulfuric acid from hexan-2-ene.

Formation of hexan-2-ene

05

(c): Pentan-2-ol

Pentan-2-ol consist of five carbon atom, and the hydroxyl group is attached to the second carbon atom.It is a polar solvent used as an intermediate to form a product.It is also secondary alcohol.

06

Reaction

When pentan-2-olis treated with sulfuric acid forms pentan-2-ene.

Formation of pent-2-ene

07

1-methylcyclohexanol

1-methylcyclohexanol is a cyclic compound used as a solvent, in making soap.It is tertiary alcohol that consists of an alcohol and methyl group attached to the first carbon atom.

08

Reaction

When 1-methylcyclohexanolis treated with sulfuric acid to form 1-methyl cyclopentan-1-ene.

Formation of 1-methyl cyclopentan-1-ene

09

(e): Cyclohexylmethanol

Cyclohexylmethanol is a cyclic organic compound that consists of an alcohol group, specifically hydroxyl methyl group.It is a colourless liquid.

10

Reaction

When Cyclohexylmethanol is treated with sulfuric acid to form 1-methyl cyclopentan-1-ene.

Formation of 1-methyl cyclopentan-1-ene

11

(f): Alcohol

2-methylcyclohexanol is a cyclic compound that contains methyl and alcohol groups. It is secondary alcohol and colourless.

12

Reaction

When 2-methylcyclohexanol is treated with sulfuric acid to form 1-methyl cyclopentan-1-ene.

Formation of 1-methyl cyclopentan-1-ene

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