Alkyl and Aryl Halides of Class 12

Which of the following is allylic halide

A: (1 - Bromoethyl) benzene

B: Benzyl chloride

C: 1 - Bromo benzene

D: 3 - Chloro cyclohex - 1 - ene

Solution:

Explanation:

Final Answer:

The correct option is D: 3 - Chloro cyclohex - 1 - ene.

What is the colour of copper sulphate crystals What happens when it is heated

What happens when it is heated

Solution:

Explanation:-

• Copper sulfate is blue in colour when it is heated it lost water of crystallization and becomes white.

Final Answer:-

Water of crystallization is lost during heating of copper sulfate and color changes from Blue to White

Rubber is a

A: conducting polymer

B: oriented polymer

C: elastomer

D: strong commercial fabric

Solution:

Explanation:-

• Polymers which have elastic properties are called elastomers.
• At microscopic level rubber has various disorganized clusters and long molecular flexible chains which provide it elastic property.

Final Answer:-

( C ) rubber is a elastomer

What is a glycosidic linkage

Solution:

Explanation:-

The covalent bond  which joins  the hemiacetal group of a saccharide  and hydroxyl group of

another molecule(may or may not be saccharide ) is called glycosidic Bond.

The common atom which joins the two groups  can be oxygen(O), Nitrogen(N) and Sulfur(S)

so the name of the bond  becomes O-glycosidic Bond and N-glycosidic Bond and S- glycosidic Bond respectively.

Final Answer:-

There is the linkage between the hemiacetal group of the saccharide and some other group and this link is called glycosidic linkage.

How will you convert aniline to phenol

Solution:

Explanation:-

• First aniline is converted into diazonium salt by reaction with NaNo2/ HCL

• Then the diazonium salt is treated with water to form phenol.

Final Answer:-

• Aniline is converted into phenol by converting first into diazonium salt then this salt is treated with water to form phenol.