71.

Vinegar is a solution of acetic acid which is:

• 15-20%

• 20-25%

• 6-8%

• 2-4%

In the reaction : ${\mathrm{CH}}_3\mathrm{OH} \stackrel{\mathrm{Oxidation}}{\to } \mathrm{A} \stackrel{{\mathrm{NH}}_3}{\to }\mathrm{B}$; A and B are

• HCHO, HCOONH₄

• HCOOH, HCOONH₄

• HCOOH, HCONH₂

• HCHO, HCONH₂

The cleavage of an aryl-alkyl ether with cold HI gives:

• alkyl iodide and water

• aryl iodide and water

• alkyl iodide, aryl iodide and water

• phenol and alkyl iodide

The number of σ and π bonds in a molecule of acetonitrile are respectively :

• 2,5

• 3,4

• 4,3

• 5,2

Glucose is a/an:

• polyhydroxy ketone

• alcohol

• hydrate of carbon

• pentahydroxy aldehyde