Major product '$\mathrm{B}$' of the following reaction sequence is

Choose the correct option for the following reactions.

Arrange the following in increasing order of reactivity towards nitration

A. $\mathrm{p}$-xylene

B. bromobenzene

C. mesitylene

D. nitrobenzene

E. benzene

Choose the correct answer from the options given below

Find out the major product for the above reaction.

In the following given reaction '$\mathrm{A}$' is

Given below are two statements, one is labelled as

Assertion A and the other is labelled as Reason R.

Assertion A : Benzene is more stable than hypothetical cyclohexatriene.

Reason R : The delocalized $\mathrm{\pi }$ electron cloud is attracted more strongly by nuclei of carbon atoms.

In the light of the above statements, choose the correct answer from the options given below:

Find out the major products from the following reactions.

$17\mathrm{mg}$ of a hydrocarbon (M.F. ${\mathrm{C}}_{10}{\mathrm{H}}_{16}$) takes up $8.40\mathrm{mL}$ of the ${\mathrm{H}}_2$ gas measured at $0°\mathrm{C}$ and $760\mathrm{mm}$ of $\mathrm{Hg}$. Ozonolysis of the same hydrocarbon yields

${\mathrm{CH}}_3-\underset{\underset{\mathrm{O}}{\left|\right|}}{\mathrm{C}}-{\mathrm{CH}}_3,\mathrm{H}-\underset{\underset{\mathrm{O}}{\left|\right|}}{\mathrm{C}}-\mathrm{H},\mathrm{H}-\underset{\underset{\mathrm{O}}{\left|\right|}}{\mathrm{C}}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\underset{\underset{\mathrm{O}}{\left|\right|}}{\mathrm{C}}-\underset{\underset{\mathrm{O}}{\left|\right|}}{\mathrm{C}}-\mathrm{H}$

The number of double bond/s present in the hydrocarbon is