Test: Alcohols, Phenols & Ethers - 2 - NEET MCQ

The correct answer is Option D.
An ether is more volatile than an alcohol having the same molecular formula. This is due to intermolecular hydrogen bonding in alcohols. In alcohols, H atoms are attached to electronegative O atoms. Due to this, H atom of −OH group of one alcohol molecule forms a hydrogen bond with the O atom of −OH group of the second alcohol molecule. This results in the intermolecular association. It increases the boiling point and decreases the volatility of alcohol. Such intermolecular hydrogen bonding is not possible in others as in ethers, H atoms are not attached to an electronegative O atom.

Order of alcohal towards esterification
CH₃–OH > 1°alcohal > 2°alcohal > 3°alchoal.

Hydrolysis of ester in basic Medium is known as saponification.

HCl is formed in above reaction and react with pyridine and gives

This is a esterfication reaction.

As the size of the alkyl group becomes larger, it prevents the formation of hydrogen bonds with water molecules and hence the solubility goes on decreasing with the increase in the size or mass of the compound.

The correct answer is option D
At ordinary temperatures, DIBAL-H reduces a variety of carbonyl compounds, like aldehydes, ketones, carboxylic acids and esters, to corresponding alcohols.  These reductions are chemoselective as well as stereospecific.

NaBH₄ are weak reducing agent so only acid chloride are reduced in alcohal.

 are not react with NaOH.

in above reaction molecular weight of alcohol increase by C₂H₂O = 42.

• In Williamson's synthesis, alcohol reacts with an alkyl halide to form an ether.
• Here's why some ethers might not be prepared using this method:
• The alkyl halide should preferably be primary or secondary.
• Tertiary alkyl halides are not suitable due to elimination reactions that occur instead, leading to alkenes rather than ethers.
• In the case of tertiary butyl ethyl ether, the use of a tertiary halide would result in competing elimination reactions, thus making it unsuitable for this synthesis.

Total no. of HCHO in A = 1