Draw the structural isomers of pentane.

Pick out the correct statements about the compound below.

The general molecular formula of alkynes is _____.

(A) ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}}$                    (B) ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}+2}$                 (C) ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}-2}$

Enter your correct answer as A, B or C.

In the above compound, the number of $3°$ carbon is:

What is/are true regarding the compound shown below? 

Observe the following structures and choose the correct option(s) mentioned below: 

(A) 

(B)  

The correct IUPAC name for ${\mathrm{CH}}_2=\mathrm{CH}-{\mathrm{CH}}_2-\mathrm{C}\equiv \mathrm{CH}$ is _____.

$\mathrm{A} :$ pent-$1$-en-$4$-yne

$\mathrm{B} :$ pent-$4$-en-$1$-yne

$\mathrm{C} :$pent-1-yne-1ene

Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$.