Which of the following amine will give the carbylamine test?
a.
Primary aliphatic or aromatic amine
Correct Answer
b.
Secondary amine
c.
Tertiary amine
d.
Secondary amine with different alkyl groups
Step-by-Step AI Explanation
Verified Method
Carbylamine test is a specific reaction for primary amines (aliphatic or aromatic) which react with chloroform and KOH to form isocyanides (carbylamines) having a foul smell. Only choice (1) in the source represents a primary amine (R-NH2).
Q2mcq
An alkene on ozonolysis gives methanal as one of the product. Its structure is
a.
CH3-CH=CH2
b.
CH3-CH2-CH=CH2
c.
CH2=CH-CH2-CH3
Correct Answer
d.
CH3-CH2-CH=CH-CH3
Step-by-Step AI Explanation
Verified Method
Ozonolysis of an alkene yields methanal (HCHO) only if the alkene has a terminal =CH2 group. Among the options, (3) represents CH2=CH-CH2-CH3, which produces methanal and propanal.
Q3mcq
Match the following and identify the correct option.
(a) CO(g) + H2(g) (i) Mg(HCO3)2 + Ca(HCO3)2
(b) Temporary hardness of water (ii) An electron deficient hydride
(c) B2H6 (iii) Synthesis gas
(d) H2O2 (iv) Non-planar structure
CO + H2 is synthesis gas (syngas). Temporary hardness is caused by bicarbonates. B2H6 is a classic electron-deficient hydride. H2O2 has a non-planar 'open book' structure.
Q4mcq
The freezing point depression constant (Kf) of benzene is 5.12 K kg mol–1. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off upto two decimal places) :
a.
0.20 K
b.
0.80 K
c.
0.40 K
Correct Answer
d.
0.60 K
Step-by-Step AI Explanation
Verified Method
Delta Tf = Kf * molality = 5.12 * 0.078 = 0.39936 K, which rounds to 0.40 K.
Q5mcq
On electrolysis of dil. sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be
a.
Hydrogen gas
b.
Oxygen gas
Correct Answer
c.
H2S gas
d.
SO2 gas
Step-by-Step AI Explanation
Verified Method
In dilute H2SO4 electrolysis, water is preferentially oxidized at the anode compared to the sulfate ion, resulting in the evolution of Oxygen gas.
Q6mcq
Identify compound X in the following sequence of reactions: Toluene + Cl2/hv -> X -> H2O/373K -> Benzaldehyde
Side chain chlorination of toluene with Cl2/hv followed by hydrolysis is a method to prepare benzaldehyde. Benzal chloride (C6H5CHCl2) upon hydrolysis gives benzaldehyde (C6H5CHO).
Q7mcq
Which one of the followings has maximum number of atoms?
a.
1 g of Ag(s)
b.
1 g of Mg(s)
c.
1 g of O2(g)
d.
1 g of Li(s)
Correct Answer
Step-by-Step AI Explanation
Verified Method
Number of atoms = (given mass / molar mass) * Avogadro's number * atomicity. For 1g Li: (1/7) * Na. For 1g Mg: (1/24) * Na. For 1g Ag: (1/108) * Na. For 1g O2: (1/32) * 2 * Na. Li has the smallest molar mass, resulting in the largest number of moles and atoms.
Q8mcq
Identify the correct statement from the following :
a.
Wrought iron is impure iron with 4% carbon.
b.
Blister copper has blistered appearance due to evolution of CO2.
c.
Vapour phase refining is carried out for Nickel by Van Arkel method.
d.
Pig iron can be moulded into a variety of shapes.
Correct Answer
Step-by-Step AI Explanation
Verified Method
Pig iron contains about 4% carbon and is hard but brittle. Cast iron is made from pig iron and can be cast into a variety of shapes. Wrought iron is the purest form of iron. Blister copper is due to SO2 evolution. Mond process (not Van Arkel) is used for Nickel.
Q9mcq
A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?
a.
– I effect of – CH3 groups
b.
+ R effect of – CH3 groups
c.
– R effect of – CH3 groups
d.
Hyperconjugation
Correct Answer
Step-by-Step AI Explanation
Verified Method
Stability of carbocations increases with the number of alpha-hydrogens available for hyperconjugation. A tertiary butyl carbocation has 9 alpha-hydrogens, whereas a secondary butyl carbocation has fewer, making the tertiary one more stable.
Q10mcq
Urea reacts with water to form A which will decompose to form B. B when passed through Cu2+(aq), deep blue colour solution C is formed. What is the formula of C from the following?
a.
CuSO4
b.
[Cu(NH3)4]2+
Correct Answer
c.
Cu(OH)2
d.
CuCO3⋅Cu(OH)2
Step-by-Step AI Explanation
Verified Method
Urea (NH2CONH2) reacts with water to form ammonium carbonate (A), which decomposes into ammonia (B). Ammonia reacts with Cu2+(aq) to form the deep blue complex [Cu(NH3)4]2+ (C).
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Urea reacts with water to form A which will decompose to form B. B when passed through Cu2+ (aq), deep blue colour solution C is formed. What is the formula of C from the following?
a.
CuSO4
b.
[Cu(NH3)4]2+
c.
Cu(OH)2
d.
CuCO3·Cu(OH)2
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Identify the correct statements from the following: (a) CO2(g) is used as refrigerant for ice-cream and frozen food. (b) The structure of C60 contains twelve six carbon rings and twenty five carbon rings. (c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline. (d) CO is colorless and odourless gas.
a.
(a), (b) and (c) only
b.
(a) and (c) only
c.
(b) and (c) only
d.
(c) and (d) only
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Hydrolysis of sucrose is given by the following reaction. If the equilibrium constant (KC) is 2 × 10^13 at 300 K, the value of ΔrG° at the same temperature will be:
a.
-8.314 J mol–1 K–1 × 300 K × ln(2 × 10^13)
b.
8.314 J mol–1 K–1 × 300 K × ln(2 × 10^13)
c.
8.314 J mol–1 K–1 × 300 K × ln(3 × 10^13)
d.
-8.314 J mol–1 K–1 × 300 K × ln(4 × 10^13)
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Match the following:
(a) Inhibitor of catalytic activity (i) Ricin
(b) Possess peptide bonds (ii) Malonate
(c) Cell wall material in fungi (iii) Chitin
(d) Secondary metabolite (iv) Collagen
a.
(1) (ii) (iv) (iii) (i)
b.
(2) (iii) (i) (iv) (ii)
c.
(3) (iii) (iv) (i) (ii)
d.
(4) (ii) (iii) (i) (iv)
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