1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Evening Slot

The increasing basicity order of the following compounds is :

A

B

C

D

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

Explanation

(A) In the first compound, because of +I effect of CH3CH2- group electron density increses on N atom.

(B) In the second compound, because of +I effect of two CH3CH2- group electron density is more on N atom than first compound so it is more basic than compound A.

(C) Three -CH3 group creates steric hindrance around N atom, for that reason N atom can't donate lone pair easily.

(D) Here lone pair of N atom, perticipate in resonance with benzene ring so N atom can't donate lone pair. That is why it is least basic among this four compounds.

So correct order is D < C < A < B.
2
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

3
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.
4
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.

Questions Asked from Basics of Organic Chemistry

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