Q 1 :    

In the following reaction,  

${\mathrm{H}}_3\mathrm{C}-\mathrm{C}\equiv \mathrm{CH} \underset{\text{873 K}}{\overset{\text{red hot iron tube}}{\to }} A,$

the number of sigma $\left(\sigma \right)$ bonds present in the product A, is          [2019]

• 21

   

• 9

   

• 24

   

• 18

   

Q 2 :    

Which one is the correct order of acidity?                [2017]

• $\mathrm{CH}\equiv \mathrm{CH}>{\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{CH}>{\mathrm{CH}}_2={\mathrm{CH}}_2>{\mathrm{CH}}_3-{\mathrm{CH}}_3$

   

• $\mathrm{CH}\equiv \mathrm{CH}>{\mathrm{CH}}_2={\mathrm{CH}}_2>{\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{CH}>{\mathrm{CH}}_3-{\mathrm{CH}}_3$

   

• ${\mathrm{CH}}_3-{\mathrm{CH}}_3>{\mathrm{CH}}_2={\mathrm{CH}}_2>{\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{CH}>\mathrm{CH}\equiv \mathrm{CH}$

   

• ${\mathrm{CH}}_2={\mathrm{CH}}_2>{\mathrm{CH}}_3-\mathrm{CH}={\mathrm{CH}}_2>{\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{CH}>\mathrm{CH}\equiv \mathrm{CH}$

   

Q 3 :    

Predict the correct intermediate and product in the following reaction:               

${\mathrm{H}}_3\mathrm{C}-\mathrm{C}\equiv \mathrm{CH}\underset{{\mathrm{HgSO}}_4}{\overset{{\mathrm{H}}_2\mathrm{O},{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}\underset{\left(\mathrm{A}\right)}{\mathrm{Intermediate}}\to \underset{\left(\mathrm{B}\right)}{\mathrm{Product}}$                       [2017]

Q 4 :    

The pair of electrons in the given carbanion, ${\mathrm{CH}}_3\mathrm{C}\equiv {\mathrm{C}}^{-},$ is present in which of the following orbitals?        [2016]

• $s{p}^2$

   

• $\mathrm{sp}$

   

• $2\mathrm{p}$

   

• $s{p}^3$

   

Q 5 :    

In the reaction

$\mathrm{H}-\mathrm{C}\equiv \mathrm{CH}\underset{\left(\mathrm{ii}\right) {\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Br}}{\overset{\left(\mathrm{i}\right) {\mathrm{NaNH}}_2/\mathrm{liq}.{\mathrm{NH}}_3}{\to }}\mathrm{X}\underset{\left(\mathrm{ii}\right){\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Br}}{\overset{\left(\mathrm{i}\right) {\mathrm{NaNH}}_2/\mathrm{liq}.{\mathrm{NH}}_3}{\to }}\mathrm{Y},$

X and Y are                                                                                     [2016]

• X = 2-butyne, Y = 2-hexyne

   

• X = 1-butyne, Y = 2-hexyne

   

• X = 1-butyne, Y = 3-hexyne

   

• X = 2-butyne, Y = 3-hexyne

   

Q 6 :    

Which of the following organic compounds has same hybridization as its combustion product $\left({\mathrm{CO}}_2\right)$ ?                 [2014]

• Ethane

   

• Ethyne

   

• Ethene

   

• Ethanol