Which of the following fibres is not made up of polyamides ?

• Wool

• Natural silk

• Artificial silk

• Nylon

52.

The high oxidising power offluorine is due to :

• high electron affinity

• high heat of dissociation and low heat of hydration

• high heat of hydration and low heat of dissociation

• high heat of hydration and high heat of dissociation

The reaction C₂H₅ONa + C₂H₅I $\to$ C₂H₅OC₂H₅ + Nal is known as :

• Kolbe's synthesis

• Wurtz's synthesis

• Williamson's synthesis

• Grignard's synthesis

The catalyst used in the preparation of an alkyl chloride by the action of dry HCl on an alcohol is :

• anhydrous AlCl₃

• Fecl₃

• anhydrous ZnCl₂

• Cu

In the reaction ,

R - X $\stackrel{\mathrm{Alcoholic} \mathrm{KCN}}{\to }$ B $\stackrel{\mathrm{Dilute} \mathrm{HCI} }{\to }$ B

The product B is :

• alkyl chloride

• aldehyde

• carboxylic acid

• ketone

Which of the following compounds would not evolve CO₂ when treated with NaHCO₃ solution ?

• salicylic acid

• Phenol

• anisole

• phenyl benzoate

By heating phenol with chloroform in alkali , it is converted into :

• salicylic acid

• salicylaldehyde

• anisole

• phenyl benzoate

When a mixture of calcium benzoate and calcium acetate is dry distilled , the resulting compound is :

• acetophenone

• benzaldehyde

• benzophenone

• acetaldehyde

Glucose contains in addition to aldehyde group :

• one secondary - OH and four primary - OH groups

• one primary - OH and four secondary - OH groups

• two primary - OH and three secondary - OH groups

• three primary - OH and two secondary - OH groups

A distinctive and characteristic functional group of fats is :

• a peptide group

• an ester group

• an alcoholic group

• a ketonic group