1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Morning Slot

The increasing order of the pKa values of the following compounds is :

A
B < C < D < A
B
B < C < A < D
C
D < A < C < B
D
C < B < A < D

Explanation

2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Morning Slot

The decreasing order of ease of alkaline hydrolysis for the following esters in

A
III > II > IV > I
B
IV > II > III > I
C
III > II > I > IV
D
II > III > I > IV

Explanation

More is the electrophilic character of carbonyl group of ester faster is the alkaline hydrolysis.

Since –I effect groups increase the electrophilic nature of carboxyl carbon whereas +I effect groups decrease the electrophilic nature of carboxyl carbon. Therefore, the correct decreasing order is III > II > I > IV.
3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Evening Slot

What is the IUPAC name of the following compound ?

A
4–Bromo-3-methylpent-2-ene
B
3–Bromo 1, 2-dimethylbut-1-ene
C
3–Bromo-3-methyl-1, 2-dimethylprop-1-ene
D
2-Bromo-3-methylpent-3-ene

Explanation



Note : While numbering, double bond should get least possible number on the longest path.
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 11th January Morning Slot

A 10 mg effervescent tablet containing sodium bicarbonate and oxalic acid releases 0.25 ml of CO2 at T = 298.15 K and p = 1 bar. If molar volume of CO2 is 25.0 L under such condition, what is the percentage of sodium bicarbonate in each tablet ?
[Molar mass of NaHCO3 = 84 g mol–1]
A
33.6
B
0.84
C
8.4
D
16.8

Explanation

2NaHCO3 + (COOH)2 $$ \to $$ (COONa)2 + 2H2O + 2CO2

$$ \therefore $$ 1 mole of CO2 is produced by 1 mole of NaHCO3.

Given, volume of CO2 produced = 0.25 ml

25 L of CO2 contains 1 mol

$$ \therefore $$ 0.25 ml of CO2 contains = $${1 \over {25 \times {{10}^3}}} \times 0.25$$ moles

= 10-5 moles

$$ \therefore $$ Moles of NaHCO3 = 10-5 moles

Mass of NaHCO3 = 10-5 $$ \times $$ 84 g

$$ \therefore $$ % of NaHCO3 in a tablet

= $${{84 \times {{10}^{ - 5}}} \over {10 \times {{10}^{ - 3}}}} \times 100$$ = 8.4 %

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