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
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