1
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 15th April Evening Slot

The total number of optically active compounds formed in the following reactio is :

A
Two
B
Four
C
Six
D
Zero

Explanation

The product has two chiral carbon atoms. So, it has = 2n = 22 = 4 stereoisomers.
2
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 15th April Evening Slot

The major product formed in the following reaction is :

A
B
C
D

Explanation

Pyridinium chlorochromate oxidizes primary alchohols to aldehydes and secondary alcohol to ketone.

3
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 16th April Morning Slot

Which of the following compounds will most readily be dehydrated to give alkene under acidic condition ?
A
1- Pentanol
B
4-Hydroxypentan - 2-one
C
3-Hydroxypentan - 2-one
D
2-Hydroxycyclopentanone

Explanation

Among those compounds which have most acidic hydrogen will undergo dehydration most readily. That is why 4 $$-$$ Hydroxypentan $$-$$ 2 $$-$$ one will most readily dehydrated to give unsaturated ketone.

4
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 16th April Morning Slot

The major product of the following reaction is :

A
B
C
D

Explanation

Questions Asked from Aldehydes, Ketones and Carboxylic Acids

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