Mixed MCQ chemistry -2

Primary amine with Hinsberg's reagent forms

• N-alkylbenzenesulphonamide soluble in KOH solution.

• N-alkylbenzenesulphonamide insoluble in KOH solution.

• N,N-dialkylbenzenesulphonamide soluble in KOH solution.

• N,N-dialkylbenzenesulphonamide insoluble in KOH solution.

Answer explanation

Which of the following molecules has highest dipole moment?

• CH₃CI

• CH₂Cl₂

• CHCl₃

• CCl₄

Answer explanation

Match the column I with column II and mark the appropriate choice.

• (A) → (i), (B) → (ii), (C) → (iii), (D) → (iv)

• (A) → (i), (B) → (iii), (C) → (iv), (D) → (i)

• (A) → (iv), (B) → (i), (C) → (ii), (D) → (iii)

• (A) → (iii), (B) → (iv), (C) → (ii), (D) → (i)

Arrange the following compounds in order of increasing boiling points.

1-Bromopropane, Isopropyl bromide, 1-Bromobutane

• 1-Bromobutane < 1-Bromopropane < Isopropyl bromide

• 1-Bromopropane < 1-Bromobutane < Isopropyl bromide

• 1-Bromopropane < Isopropyl bromide < 1-Bromobutane

• Isopropyl bromide < 1-Bromopropane < 1-Bromobutane

Answer explanation

The boiling point of 1-bromobutane is higher than that of 1-bromopropane because as the size of alkyl group increases boiling point increases. The boiling point of isopropyl bromide is lower than that of 1-bromopropane because as the branching increases the boiling point decreases. The boiling points of the given compounds in the increasing order :

Isopropyl bromide < 1-Bromopropane < 1-Bromobutane

The rate constant for a first order reaction is 7.0 x 10^-4 s^-1 If initial concentration of reactant is 0.080 M, is the half life of reaction?

• 990 s

• 79.2 s

• 12375 s

• 10.10 x 10^-4 s

Answer explanation

Which is the product of the following reaction?

• 
• 
• 
• 

Answer explanation

A solution containing 2.675 g of CoCl₃.6NH, (molar mass = 267.5 g mol^-1) is passed through a cation

exchanger. The chloride ions obtained in solution were treated with excess of AgNO₃ to give 4.78 g of AgCl

(molar mass = 143.5 g mol^-1). The formula of the complex is (At. mass of Ag = 108 u)

• [CoCI(NH₃)₅]Cl₂

• [Co(NH₃)₆)Cl₃

• [CoCl₂(NH₃)₄]CI

• [CoCl₃(NH₃)₃]

Answer explanation

• Sucrose

• Amylose

• Lactose

• Maltose

Answer explanation

What is the correct order of spin-only magnetic moment (in B.M.) of Mn²⁺, Cr²⁺ and V²⁺?

• Mn²⁺> v²⁺ > Cr²⁺

• v²⁺> Cr²⁺ > Mn²⁺

• Mn²⁺ > Cr²⁺> v²⁺

• Cr²⁺> V²⁺ > Mn²⁺

Answer explanation

For a reaction, activation energy E_a = 0 and the rate constant at 200 K is 1.6 x 10⁶ s^-1. The rate constant:

400 K will be

(Given that gas constant R = 8314J K^-1 mol^-1]

• 3.2 x 10⁴ s^-1

• 1.6 × 10⁶ s^-1

• 1.6 x 10³ s^-1

• 3.2 x 10⁶ s^-1

Answer explanation