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1

JEE Main 2019 (Online) 12th January Morning Slot

MCQ (Single Correct Answer)
The major product of the following reaction is

A
B
C
photo due
D

Explanation

2

JEE Main 2019 (Online) 12th January Morning Slot

MCQ (Single Correct Answer)
The correct order for acid strength of compounds :

CH $$ \equiv $$ CH, CH3–C $$ \equiv $$ CH and CH2 = CH2 is as follows
A
CH $$ \equiv $$ CH > CH2 = CH2 > CH3 – C $$ \equiv $$ CH
B
CH3 – C $$ \equiv $$ CH > CH2 = CH2 > HC $$ \equiv $$ CH
C
HC $$ \equiv $$ CH > CH3 – C $$ \equiv $$ CH > CH2 = CH2
D
CH3 – CH $$ \equiv $$ CH > CH $$ \equiv $$ CH > CH2 = CH2

Explanation

Among CH $$ \equiv $$ CH and CH2 = CH2, in CH $$ \equiv $$ CH compound H atom is attached with sp hybridised C atom and in CH2 = CH2 compound H atom is attached with sp2 hybridised C atom.

As we know, electronegitivity of sp carbon is more compare to sp2 carbon atom and that H is more acidic which is attached with more electronegative carbon atom. So CH $$ \equiv $$ CH is more acidic than CH2 = CH2.

Among CH $$ \equiv $$ CH and CH3–C $$ \equiv $$ CH, in CH $$ \equiv $$ CH both the H atom is connected to sp carbon atom but in CH3–C $$ \equiv $$ CH, with one sp carbon atom H atom attached and with other sp carbon atom -CH3 group attached which have +I effect and we know +I effect decreases acidic strength.
So, CH $$ \equiv $$ CH is more acidic than CH3–C $$ \equiv $$ CH.

So correct order is

HC $$ \equiv $$ CH > CH3 – C $$ \equiv $$ CH > CH2 = CH2
3

JEE Main 2019 (Online) 11th January Evening Slot

MCQ (Single Correct Answer)
Which of the following compounds will produce a precipitate with AgNO3 ?
A
B
C
D

Explanation

4

JEE Main 2019 (Online) 11th January Morning Slot

MCQ (Single Correct Answer)
The major product of the following reaction is :

A
B
C
D

Explanation

Questions Asked from Hydrocarbons

On those following papers in MCQ (Single Correct Answer)
Number in Brackets after Paper Indicates No. of Questions
JEE Main 2022 (Online) 26th July Morning Shift (1)
JEE Main 2021 (Online) 20th July Morning Shift (1)
JEE Main 2021 (Online) 18th March Evening Shift (1)
JEE Main 2021 (Online) 18th March Morning Shift (1)
JEE Main 2021 (Online) 25th February Evening Shift (1)
JEE Main 2021 (Online) 25th February Morning Shift (1)
JEE Main 2021 (Online) 24th February Morning Shift (1)
JEE Main 2020 (Online) 6th September Evening Slot (1)
JEE Main 2020 (Online) 5th September Evening Slot (1)
JEE Main 2020 (Online) 3rd September Morning Slot (1)
JEE Main 2020 (Online) 2nd September Morning Slot (1)
JEE Main 2020 (Online) 9th January Evening Slot (2)
JEE Main 2020 (Online) 9th January Morning Slot (3)
JEE Main 2020 (Online) 8th January Evening Slot (3)
JEE Main 2020 (Online) 7th January Evening Slot (1)
JEE Main 2019 (Online) 12th April Evening Slot (2)
JEE Main 2019 (Online) 12th April Morning Slot (2)
JEE Main 2019 (Online) 10th April Evening Slot (1)
JEE Main 2019 (Online) 10th April Morning Slot (1)
JEE Main 2019 (Online) 9th April Morning Slot (1)
JEE Main 2019 (Online) 8th April Evening Slot (2)
JEE Main 2019 (Online) 12th January Evening Slot (1)
JEE Main 2019 (Online) 12th January Morning Slot (2)
JEE Main 2019 (Online) 11th January Evening Slot (1)
JEE Main 2019 (Online) 11th January Morning Slot (2)
JEE Main 2019 (Online) 10th January Morning Slot (2)
JEE Main 2018 (Online) 16th April Morning Slot (1)
JEE Main 2018 (Offline) (1)
JEE Main 2018 (Online) 15th April Evening Slot (2)
JEE Main 2017 (Online) 9th April Morning Slot (1)
JEE Main 2016 (Offline) (2)
JEE Main 2015 (Offline) (1)
AIEEE 2012 (2)
AIEEE 2011 (1)
AIEEE 2010 (1)
AIEEE 2008 (4)
AIEEE 2007 (3)
AIEEE 2005 (5)
AIEEE 2003 (2)
AIEEE 2002 (2)

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