Amount of oxalic acid present in a solution can be determined by its titration with KMnO₄ solution in the presence of H₂SO₄. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

• gets oxidised by oxalic acid to chlorine

• furnishes H+ions in addition to those from oxalic acid

• reduces permanganate to Mn²⁺

• reduces permanganate to Mn²⁺

The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is

• −COOH, −SO₃H, −CONH₂, −CHO

• −SO₃H, −COOH, −CONH₂, −CHO

• −CHO, −COOH, −SO₃H, −CONH₂

• −CHO, −COOH, −SO₃H, −CONH₂

CH₃Br + Nu^- → CH₃ -Nu +Br-
The decreasing order of the rate of the above reaction with nucleophiles (Nu–) A to D is
[Nu–=
(A) PhO^–
(B) AcO^–
(C) HO^–
(D) CH3O^–
]

• D > C > A > B

• D > C > B > A

• A > B > C > D

• A > B > C > D

The increasing order of stability of the following free radicals is

Due to the presence of an unpaired electron, free radicals are:

• Chemically reactive

• Chemically inactive

• Anions

• Anions

The decreasing order of nucleophilicity among the nucleophiles

• (a), (b), (c), (d)

• (d), (c), (b), (a)

• (b), (c), (a), (d)

• (b), (c), (a), (d)

Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is

• n-hexane

• 2, 3-dimethylbutane

• 2,2-dimethylbutane

• 2,2-dimethylbutane

An organic compound having molecular mass 60 is found to contain C = 20%, H = 6.67% and N = 46.67% while rest is oxygen. On heating, it gives NH3 along with a solid residue. The solid residue give violet colour with alkaline copper sulphate solution. The compound is

• CH₃NCO

• CH₃CONH₂

• (NH₂)₂CO

• (NH₂)₂CO

The ammonia evolved from the treatment of 0.30 g of an organic compound for the estimation of nitrogen was passed in 100 mL of 0.1 M sulphuric acid. The excess of acid required 20 mL of 0.5 M sodium hydroxide solution hydroxide solutio for complete neutralization. The organic compound is

• acetamide

• thiourea

• urea

• urea

When metal  ‘M’ is treated with NaOH, a white gelatinous precipitate ‘X’ is obtained, which is soluble in excess of NaOH. Compound ‘X’ when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal ‘M’ is

• Fe

• Zn

• Ca

• Al