Which is a suitable method to decrease friction ?

Which of the following reactions are suitable method for the preparation of primary amines?

Name a few methods of increasing friction.

Which is the most suitable method for removing the traces of water from ethanol ?

For each of the salt : A, B, C and D, suggest a suitable method of its preparation : D is a soluble salt of zinc.

For each of the salt : A, B, C and D, suggest a suitable method of its preparation : A is a sodium salt.

For each of the salt : A, B, C and D, suggest a suitable method of its preparation : C is a soluble salt of copper

For each of the salt : A, B, C and D, suggest a suitable method of its preparation : B is an insoluble salt.

Which reaction is suitable for the preparation of alpha -chloroacetic acid?

Which of these is an in-situ method of conservation ?

Preparation of ethers by acid dehydration of secondary or tetiary alcohols is not a suitable method. Give reason.