21.

When BaCl₂ is added to an aqueous salt solution, a white precipitate is obtained. The anion among CO${}_3^{2-}$-, SO${}_3^{2-}$- and SO${}_4^{2-}$ that was present in the solution can be

• CO${}_3^{2-}$ but not any of the other two

• SO${}_3^{2-}$ but not any of the other two

• SO${}_4^{2-}$ but not any of the other two

• Any of them

In the IUPAC system, PhCH₂CH₂CO₂H is named as

• 3-phenylpropanoic acid

• benzylacetic acid

• carboxyethylbenzene

• 2-phenylpropanoic acid

The isomerisation of 1-butyne to 2-butyne can be achieved by treatment with

• hydrochloric acid

• ammoniacal silver nitrate

• ammoniacal cuprous chloride

• ethanolic potassium hydroxide

The correct order of acid strengths of benzoic acid (X), peroxybenzoic acid (Y) and p-nitrobenzoic acid (Z) is

• Y > Z > X

• Z > Y > X

• Z > X > Y

• Y > X > Z

The structure of the product P of the following reaction is

How many faradays are required to reduce 1 mol of Cr₂O${}_7^{2-}$ to Cr³⁺ in acid medium?

• 2

• 3

• 5

• 6

The reduction of benzenediazonium chloride to phenyl hydrazine can be accomplished by

• SnCl₂, HCl

• Na₂SO₃

• CH₃CH₂OH

• H₃PO₂

The major product(s) obtained form the following reaction of 1 mole of hexadeuteriobenzene is/are

The conversion of CH₃-CH₂-COOH to

accomplished by

• SOCl₂, LiAlH₄, ethylene glycol

• SOCl₂, KMnO₄, NH₂NH₂

• SnCl₂, HCl, Na₂SO₃

• HCl, SnCl₂, ethylene glycol

The number of unpaired electrons in[NiCl₄]^2-, Ni(CO)₄ and (Cu(NH₃)₄]²⁺ respectively are

• 0, 2, 1

• 2, 0, 1

• 0, 2, 1

• 2, 2, 0