Alkynes

C₁ - C₂ bond is shortest in:

When propyne is treated with aqueous ${\text{H}}_2\text{S}{\text{O}}_4$ in presence of $\text{H}\text{g}\text{S}{\text{O}}_4$, the major product is:

The product(s) obtained via hydration $({\mathrm{HgSO}}_4+{\mathrm{H}}_2{\mathrm{SO}}_4)$ of 1-butyne would be:

The number of possible structural and configurational isomers of a bromo compound, formed by the addition of 1 mole of HBr to 2-pentyne respectively, are –

The reagent(s) for the following conversion,

$\mathrm{Br}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{Br} \stackrel{?}{\to } \mathrm{CH}\equiv \mathrm{CH}$

is/are

Which of the following reagents on reaction with acetylene yield same product?

$\mathrm{A}. {\mathrm{O}}_3/{\mathrm{H}}_2\mathrm{O}+{\mathrm{H}}^{+}$                      $\mathrm{B}. {\mathrm{KMNO}}_4/{\mathrm{OH}}^{-}/{\mathrm{H}}_2\mathrm{O} \left(\mathrm{cold}\right)$

$\mathrm{C}. {\mathrm{SeO}}_2$                                       $\mathrm{D}. {\mathrm{O}}_{3 }+ {\mathrm{H}}_2\mathrm{O}/\mathrm{Zn}$

The reagent(s) for the following conversion, 

Most acidic hydrogen is present in:

Explain the acidic character of alkyne.

Draw the structure of the following:
(i) Prop-1-yne
(ii) 2-methyl butane

In the following reaction$\mathrm{X} \mathrm{and} \mathrm{Y}$ are

$$\begin{gathered} \begin{array}{ccccc}{\mathrm{C}}_8{\mathrm{H}}_6& \stackrel{\mathrm{Pd}-{\mathrm{BaSO}}_4/{\mathrm{H}}_2}{\to }& {\mathrm{C}}_8{\mathrm{H}}_8& \underset{\mathrm{ii}. {\mathrm{H}}_2{\mathrm{O}}_2,\mathrm{NaOH}}{\overset{\mathrm{i}.{\mathrm{B}}_2{\mathrm{H}}_6}{\to }}& \mathrm{X}\end{array} \\ \begin{array}{ccccc}{\mathrm{C}}_8{\mathrm{H}}_6& \underset{{\mathrm{H}}_2{\mathrm{SO}}_4,{\mathrm{HgSO}}_4}{\overset{{\mathrm{H}}_2\mathrm{O},}{\to }}& \mathrm{Y}& & \end{array} \end{gathered}$$

The product P in the above reaction is

How the compound ${\mathrm{C}}_4{\mathrm{H}}_5\mathrm{OH}$ is formed?

Which of the following compounds has a cylindrical symmetry?

How many reagents from the list below give effervescence when reacted with $1-\mathrm{pentyne}$?

$$\begin{gathered} \mathrm{NaOH}\left(\mathrm{I}\right), {\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{ONa}\left(\mathrm{II}\right), {\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{MgBr}\left(\mathrm{III}\right), \\ \mathrm{NaH}\left(\mathrm{IV}\right), {\mathrm{NaNH}}_2\left(\mathrm{V}\right), \mathrm{Na}\left(\mathrm{VI}\right), {\mathrm{NaHCO}}_3\left(\mathrm{VII}\right), \\ {\left[({\mathrm{CH}}_3{)}_2\mathrm{CH}\right]}_2\mathrm{NLi}\left(\mathrm{VIII}\right), {\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Li}\left(\mathrm{IX}\right), {\mathrm{C}}_6{\mathrm{H}}_5\mathrm{Li}\left(\mathrm{X}\right) \end{gathered}$$

The total number structural isomers of alkynes that on catalytic reduction gives $3-$ethyl$-4-$methylheptane are:

An internal alkyne(P) with formula ${\mathrm{C}}_4{\mathrm{H}}_6$ reacts with ${\mathrm{NaNH}}_2$ to form a sodium salt of terminal alkyne $\left(Q\right)$. $\left(Q\right)$ reacts with ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Br}$ to form ($\mathrm{R}$). Reaction of $\left(\mathrm{R}\right)$ with excess $\mathrm{HCl}$ forms $\left(\mathrm{S}\right)$ Answer the following questions on the basis of above write up.
The structure of $\mathrm{P}$ is

Complete the following reaction sequence: $\mathrm{HC}\equiv \mathrm{CH}\stackrel{{\mathrm{LiNH}}_2}{\to }\mathrm{A}\stackrel{{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Cl}}{\to }\mathrm{B}\stackrel{\mathrm{HBr}}{\to }\mathrm{C}$. Comment on the acidic nature of $\mathrm{B}$.