Write the condensed formula for the following compound :

Isopropyl alcohol

A: ${\mathrm{C}}_3{\mathrm{H}}_8\mathrm{O}$

B: ${\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}$

C: ${\mathrm{C}}_4{\mathrm{H}}_8\mathrm{O}$

Enter your correct answer as A, B or C.

Give the structural formula of $2-$Methylpropan$-2-$ol.

Newman projections $\mathrm{P},\mathrm{Q},\mathrm{R}$ and $\mathrm{S}$ are shown below:

  Which one of the following options represent identical molecules?

How many pi bonds and sigma bonds are present in following molecule?

Which of the following structures contain $sp$-hybridised carbon atom(s)?

I. $\mathrm{HC}\equiv \mathrm{CH}$

II. ${\mathrm{H}}_2\mathrm{C}=\mathrm{C}={\mathrm{CH}}_2$

III. 

IV.