Although anti conformation is more stable than the gauch conformation but in some cases gauch or skew conformation is more stable than the anti confirmation why?

Gauch or skew conformation is more stable than the anti because of the intramolecular hydrogen bonding which is geometrically possible only in the gauch conformation.

For examples:

Ethane-1,2-diol, 2-Fluoroethan-1-ol, 2-chloroethan-1-ol and 2-Aminoethanol etc.
2-chloroethane-1-ol:

Ethane-1,2-diol:

Realated Questions:

How many cyclic isomers possible of (C6H12) Hexene?

How many cyclic isomers possible of (C5H10) pentene?

Write the major and minor product of hydration of 1-Methylcyclopent-1-ene in acidic medium?

Why enol form of Beta Dicarbonyl compound more stable than those of monocarbonyl compounds?

Why enol form of phenol is more stable than its keto isomers?

What is fries rearrangment acylation ?

Conversion of phenolic esters of aliphatic and aromatic carboxylic acids into ortho- and para-acylphenols in the presence of FCR catalyst (AlCl3). Is know as Fries rearrangement.

Related questions:
What is difference between Houben–Hoesch acylation reaction and Gatter- mann–Koch formylation reaction? 

More reated Questions:

Penta-1,3-diene is more stable than penta-1,4 -diene. Why?

Phenoxide ion is more stable than an alkaoxide. why?

Why does aqueous sodium bicarbonate solution dissolve carboxylic acids but not phenol though they are also acidic ?

Why enol form of Beta Dicarbonyl compound more stable than those of monocarbonyl compounds?

Why enol form of phenol is more stable than its keto isomers?

Reactivity order of Pyrrole, Furan and Thiophene towards Electrophilic substitution :

Phenyl group is known to extract negative inductive effect, but each phenyl ring in biphenyl is more reactive than benzene towards Electrophilic substation. Why?

Chloroform is more acidic than fluoroform why?

Fluorine is more electronegative than chlorine even then, p-flurobenzoic acid is weaker acid than p-chlorobenzoic acid explain ? 

Trifluoroethyl carbocation is less stable than trifluromethyl carbocation why ?

Why is the Tropylium carbocation less stable than the tricyclopropylmethyl carbocation?

What is difference between Houben–Hoesch acylation reaction and Gatter- mann–Koch formylation reaction?

Houben–Hoesch reaction ia an analogous reaction  of Gatter-mann–Koch reaction, it is sometimes called the Hoesch reaction.

Houben–Hoesch reaction:

Hoesch reaction is basically FACT acylation of aromatic compounds with nitriles and HCl.

Gatter-mann–Koch reaction:

Gatter-mann–Koch reaction is formulation of benzene ring in the presence of CO and HCl.

How write mechanism of exhaustive methyl and Hoffmann elimination of ethanamine?

Related Questions:

(1) Explain Dehydration and ring expansion mechanism of 1-(1-Methylcyclopentyl)ethan-ol?

(2) Write Dehydration and ring expansion mechanism of 1-cyclobutylethanol in the presence of con H2SO4.

(3) How to write dehydration and ring expansion mechanism of 2-cyclopentylethanol?

(4) Dehydration of 1-(1-Methylcyclopentyl)ethan-ol follow E1 Elimination Mechanism and take place in the presence concentrate sulphuric acid:

(5) Explain the ring expansion mechanism of Bicyclic 1,2-Diols which undergoes pinacol pinacolone mechanism?

(6) How to write dehydration and ring expansion mechanism of 2-cyclopentylethanol?
(7) Write the major and minor product of hydration of 1-Methylcyclopent-1-ene in acidic medium?

(8) How to write Bechmann rearrangment mechanism involved formation of oxime of cyclohexane and transformation into cyclic amide caprolactam?

(9) Explain Exhaustive alkylation and Hoffmann Elimination.

(10) What is mechanism of exhaustive methylation and Hoffmann elimination of piperidine a secondary amine?

(11)How write mechanism of exhaustive methyl and Hoffmann elimination of ethanamine?

What is mechanism of exhaustive methylation and Hoffmann elimination of piperidine a secondary amine?

This reaction can be used to determine the structure of amines especially in complex molecules such as alkaloids.

Related Questions:

(1) Explain Dehydration and ring expansion mechanism of 1-(1-Methylcyclopentyl)ethan-ol?

(2) Write Dehydration and ring expansion mechanism of 1-cyclobutylethanol in the presence of con H2SO4.

(3) How to write dehydration and ring expansion mechanism of 2-cyclopentylethanol?

(4) Dehydration of 1-(1-Methylcyclopentyl)ethan-ol follow E1 Elimination Mechanism and take place in the presence concentrate sulphuric acid:

(5) Explain the ring expansion mechanism of Bicyclic 1,2-Diols which undergoes pinacol pinacolone mechanism?

(6) How to write dehydration and ring expansion mechanism of 2-cyclopentylethanol?
(7) Write the major and minor product of hydration of 1-Methylcyclopent-1-ene in acidic medium?

(8) How to write Bechmann rearrangment mechanism involved formation of oxime of cyclohexane and transformation into cyclic amide caprolactam?

(9) Explain Exhaustive alkylation and Hoffmann Elimination.

(10) What is mechanism of exhaustive methylation and Hoffmann elimination of piperidine a secondary amine?

(11)How write mechanism of exhaustive methyl and Hoffmann elimination of ethanamine?