OC A-group

Choose the CORRECT statement from the following,

• Aromatic nitro compounds are soluble in organic solvents.

• Nitrobenzene and nitrotoluene are pale yellow liquids having pleasant sweetish odors.

• Density of nitrobenzene is higher than water.

• All of these

Aromatic amines when treated with nitrous acid in cold mineral acid solution yield

• Aryldiazonium Salts.

• Benzenesulphonate

• Benzene m-disulphonic acid.

• 4-nitro aromatic amines.

The aniline on heated with oleum generate compound

• Anthranilic acid.

• 2-carbamoylbenzoic acid.

• Phthalic acid.

• Sulphanilic acid.

Benzene diazonium chloride on treatment with beta-naphthol

• p-amino azobenzene.

• p-hydroxy azobenzene.

• benzene azo beta-naphthol

• diazoamino benzene.

Benzene diazonium chloride on treatment with cuprous cyanide

• p-amino azobenzene.

• p-hydroxy azobenzene.

• Phenyl nitrile.

• diazoamino benzene.

The cellulose on treatment with nitric acid generates the product which can be used in explosives is

• Flash cotton.

• Guncotton

• Nitrocellulose

• All of these.

How many stereoisomers can be possible with D-glucose?

• 4

• 6

• 1

• 8

Among the following which is NOT isomer of aldohexose?

• Tallose

• Allose

• Fructose

• Glucose

The CORRECT statement about soluble starch and dextrin is that,

• Dextrin is insoluble in cold water while soluble starch requires catalyst for complete solubilization.

• Dextrins have less reducing property than soluble starch.

• With Iodine dextrin form blue complex while soluble starch forms reddish blue or violet.

• None of the above.

Choose the FALSE statement from the following about Cellulose,

• Certain enzymes called AMYLASES have depolymerizing effect on starches.

• Weak acids like acetic acid carbonic acid have little or no action on cellulose under most conditions.

• The degree of polymerization of amylose is more than cellulose.

• Hydrocellulose has more reducing properties than cellulose.