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1

NEET 2016 Phase 1

MCQ (Single Correct Answer)
Consider the nitration of benzene using mixed conc.H2SO4 and HNO3. If a large amount of KHSO4 is added to the mixture, the rate of nitration will be
A
unchanged
B
doubled
C
faster
D
slower

Explanation

H2SO4 + HNO3 $$ \to $$ $$NO_2^ + $$ + $$HSO_4^ - $$ + $${H_3}{O^ + }$$

KHSO4 $$ \to $$ K+ + $$HSO_4^ - $$

Due to common ion effect backward reaction will take place so the formation $$NO_2^ + $$ decrease so nitration process will become slower.
2

NEET 2016 Phase 2

MCQ (Single Correct Answer)
The compound that will react most readily with gaseous bromine has the formula
A
C3H6
B
C2H2
C
C4H10
D
C2H4

Explanation

Propene is most reactive towards Br2 (gaseous) than CH2 = CH2, HC $$ \equiv $$ CH and butane due to most electron density.
3

NEET 2016 Phase 2

MCQ (Single Correct Answer)
Which of the following compounds shall not produce propene by reaction with HBr followed by elimination or direct only elimination reaction ?
A
B
C
D

Explanation

4

NEET 2016 Phase 2

MCQ (Single Correct Answer)
In the given reaction,


the product P is
A
B
C
D

Explanation

Joint Entrance Examination

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Medical

NEET

CBSE

Class 12