What type of orbital overlap results in the formation of the C–H and C–C bonds in ethane?

1. ${\mathrm{sp}}^3-\mathrm{s}<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{sp}}^3-{\mathrm{sp}}^3$

2. ${\mathrm{sp}}^2-\mathrm{s}<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{sp}}^2-{\mathrm{sp}}^2$

3. sp – sp and sp – sp 

4. p–s and p – p

Which alkene among the following reacts the fastest with H₂​ under catalytic conditions?
 

1.		2.
3.		4.

The compound that has least hindered rotation around carbon-carbon bond is-

The molecule among the following that has the hybridization ${\mathrm{sp}}^2,\hspace{0.17em}{\mathrm{sp}}^2,\hspace{0.17em}\mathrm{sp},\; and\hspace{0.17em}\mathrm{sp}$ from left to right atoms is:

1. $\mathrm{HC}\equiv \mathrm{C}-\mathrm{C}\equiv \mathrm{H}$

2. ${\mathrm{CH}}_2=\mathrm{CH}-\mathrm{C}\equiv \mathrm{CH}$

3. ${\mathrm{CH}}_2=\mathrm{CH}-\mathrm{CH}={\mathrm{CH}}_2$ 

4. ${\mathrm{CH}}_2-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3$

In the given hydrocarbon, 

 
The type/state of hybridization of carbons 1, 3, and 5 respectively are:

1. sp², sp, sp³

2. sp, sp³, sp²

3. sp, sp², sp³

4. sp³, sp², sp