The dihedral angle of the least stable conformer of ethane is:

Which of the following statement(s) is/are correct about the elimination reaction of 2-Bromopentane to form pent-2-ene:
a. $\mathrm{\beta }$-Elimination reaction
b. Follows Zaitsev rule
c. Dehydrohalogenation reaction
d. Dehydration reaction

Which of the following is a free radical substitution reaction?

1. Benzene with Br₂/AlCl₃

2. Acetylene with HBr

3. Methane with Br₂/hv

4. Propene with HBr/(C₆H₅COO)₂

An alkene "A" on reaction with ${\mathrm{O}}_3$ and $\mathrm{Zn}-{\mathrm{H}}_2\mathrm{O}$ gives propanone and ethanal in equimolar ratio. The addition of HCl to alkene "A" gives "B" as the major product. The structure of product "B" is:

1.		2.
3.		4.

The most suitable reagent for the following conversion is-

1.  Hg²⁺/ H⁺, H₂O

2. Na/liquid NH₃

3. H₂, Pd/C, quinoline

4. Zn/HCl