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

1.	60°	2.	0°
3.	120°	4.	180°

The major product of the following chemical reaction is:

1.
2.
3.
4.

What reagents are used to convert ethanoic acid into ethane?

The correct reagent that is used for the following reaction is: 

${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_3\stackrel{?}{⟶}{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CHO}$

1. Manganese acetate

2. Copper at high temperature and pressure

3. Molybdenum oxide

4. Potassium permanganate

Four structures are given in options (a) to (d). Examine them and select the aromatic structures.

a.		b.
c.		d.

Choose the correct option

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

Among the following reactions, incomplete combustion of methane is:

Arrange the following alkyl halides in decreasing order of the rate of $\mathrm{\beta }$-elimination reaction with alcoholic KOH.

A.
B.	CH3-CH2-Br
C.	CH3-CH2-CH2-Br

1. A > B > C

2. C > B > A

3. B > C > A

4. A > C > B

Match the reagent from Column I which on reaction with CH₃-CH=CH₂ gives the same product given in Column II as per the codes given below

Codes:

The correct order of decreasing reactivity of the following compounds:

Chlorobenzene, 2,4-Dinitrochlorobenzene, and p-Nitrochlorobenzene

with an electrophile (E⁺)  is :