An alkene on ozonolysis gives methanal as one of the products. Its structure is:

1.  
 2.   

3.   
4.   

Which of the following alkane cannot be made in good yield by Wurtz reaction?

1. 2,3-Dimethylbutane

2. n-Heptane

3. n-Butane

4. n-Hexane

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
1. (a), (c), (d)
2. (b), (c), (d)
3. (a), (b), (d)
4. (a), (b), (c)

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

In the following reaction

${\mathrm{H}}_3\mathrm{CC}\equiv \mathrm{CH}\underset{873 \mathrm{K}}{\overset{\mathrm{Red} \mathrm{Hot} \mathrm{Iron} \mathrm{Tube}}{\to }}\mathrm{A}$

The number of ($\sigma$) bonds present in the product (A) is-

1. 21 

2. 9

3. 24

4. 18

The alkane that gives only one monochloro product on chlorination with $C{l}_2$ in presence of diffused sunlight is -

1. 2,2,-dimethylbutane

2. neopentane

3. n-pentane

4. Isopentane

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. 

The reaction among the following that proceeds through an electrophilic substitution reaction is:

1. 

2. 

3. 

4. 

The most suitable reagent for the following conversion is-

1.  ${\mathrm{Hg}}^{2+}/{\mathrm{H}}^{+} , {\mathrm{H}}_2\mathrm{O}$

2.  Na/liquid NH₃

3.  H₂, Pd/C, quinoline

4.  Zn/HCl