Methods of Purification of Organic Compounds Questions

Ques. The IUPAC name of picric acid is
(a) 2,4,6-trinitrophenol
(b) 2,4,6-trinitrobenzoic acid
(c) 4-nitrophenol
(d) None of these

Ans. (a)

Ques. 58 ml of N/5 H₂SO₄ are used to neutralize ammonia given by 1 g of organic compound. Percentage of nitrogen in the compound is
(a) 34.3
(b) 82.7
(c) 16.2
(d) 21.6

Ans. (c)

Ques. IUPAC name of (CH₃)₂CH – CHO is:
(a) 1-methyl-2 propanal
(b) 2, 2-dimethyl propanal
(c) None of these
(d) 2-methyl propanal

Ans. (d)

Ques. Which of the following relations gives the value of n =
(a) Molecular Mass / Atomic Mass
(b) Molecular Mass / Empirical Mass
(c) None of these
(d) Empirical Mass / Molecular Mass

Ans. (b)

Ques. 0.2595g of an organic substance in a quantitative analysis yielded 0.35 g of the barium sulphate. The percentage of sulphur in the substance is
(a) 18.52g
(b) 182.2 g
(c) 17. 5 g
(d) 175.2g

Ans. (a)

Ques. If a compound on analysis was found to contain C = 18.5%, H = 1.55%, Cl = 55.04% and O = 24.81%, then its empirical formula is
(a) CHClO
(b) CCIOH
(c) CHOCl
(d) ClCHO

Ans. (a)

Ques. The IUPAC name of crotonaldehyde is
(a) Prop-2-ene-1-al
(b) Propenal
(c) But-2-ene-1-al
(d) Butenal

Ans. (c)

Ques. 116 mg of a compound on vaporisation in a Victor Meyer’s apparatus displaces 44.8 ml of air measured at S.T.P. The molecular weight of the compounds is
(a) 116
(b) 232
(c) 58
(d) 44.8

Ans. (c)

Ques. The vapour density of the methyl ester of an organic monocarboxylic acid is 37. What is the molecular weight of the acid
(a) 46
(b) 60
(c) 70
(d) 74

Ans. (d)

Ques. If 0.228 g of silver salt of dibasic acid gave a residue of 0.162g of silver on ignition then molecular weight of the acid is
(a) 70
(b) 80
(c) 90
(d) 100

Ans. (c)

Ques. In Victor Mayer’s method 0.2 gm of an organic substance displaced 56 ml of air at STP the molecular weight of the compound
(a) 56
(b) 112
(c) 80
(d) 28

Ans. (c)

Related: Chemical Bonding question bank

Ques. A gas mixture contains 50% helium and 50% methane by volume. What is the percent by weight of methane in the mixture
(a) 19.97%
(b) 20.05%
(c) 50%
(d) 80.03%

Ans. (d)

Ques. Which of the following compound has the functional group –OH
(a) 1, 2-ethandiol
(b) 2-butanone
(c) Nitrobenzene
(d) Ethanal

Ans. (a)

Ques. The IUPAC name of CH₃COCH(CH₃)₂is
(a) Isopropylmethyl ketone
(b) 2-methyl-3-butanone
(c) 4-methylisopropyl ketone
(d) 3-methyl-2-butanone

Ans. (d)

Ques. The most appropriate statement regarding organic compounds is
(a) They possess ionic and covalent bonds
(b) Presence of carbon is not essential
(c) They are found in a large number
(d) Their reactions are fast

Ans. (c)

Ques. Name the alkene with molecular formula C₁₀H₂₀
(a) Dodecene
(b) Undecene
(c) Decene
(d) Heptene

Ans. (c)

Ques. IUPAC name of (CH₃)₂CH – CH₂ – CH₂Br is
(a) 1-bromopentane
(b) 2-methyl-4-bromobutane
(c) 1-bromo-3-methylbutane
(d) 2-methyl-3-romopropane

Ans. (c)