NEET 2020 CHEMISTRY QUESTIONS 1-5

 Questions 1. Identify compound X in the following sequences of reactions:

Solution:

Answer: a

Question 2. Identify a molecule which does not exist.

a)C2

b)O2

c)He2

d)Li2

Solution:

Answer: c

Diatomic molecule for which bond order is zero or negative does not exist.

Question 3. Which of the following is a natural polymer?

a)polybutadiene

b)poly (Butadiene-acrylonitrile)

c)cis-1,4-polyisoprene

d)poly (Butadiene-styrene)

Solution:

Answer: c

Question 4. An increase in the concentration of the reactants of a reaction leads to change in:

a)threshold energy

b)collision frequency

c)activation energy

d)heat of reaction

Solution:

Answer: b

Collision frequency, as number of molecules per unit volume increases.

Question 5. Anisole on cleavage with HI gives:

Solution:

Answer: c