The total number of isomers of ${\mathrm{C}}_4{\mathrm{H}}_8$ are-

1.	8	2.	7
3.	6	4.	5

The optically active compound among the following is-

1. Butane

2. 2-Methyl pentane

3. 4-Methyl pentane

4. 3-Methyl hexane

The R and S enantiomers of an optically active compound differ in:

1. Their optical rotation of plane-polarized light.

2. Their reactivity with chiral reagents.

3. Their solubility in achiral reagents.

4. Their melting points.

The number of primary amines of the formula ${\mathrm{C}}_4{\mathrm{H}}_{11}\mathrm{N}$ are :

But-2-ene exhibits cis-trans isomerism due to-

1. Rotation around ${\mathrm{C}}_3-{\mathrm{C}}_4$ sigma bond

2. Rotation around  ${\mathrm{C}}_1-{\mathrm{C}}_2$ bond

3. Restricted rotation around C=C bond

4. Rotation around  ${\mathrm{C}}_2-{\mathrm{C}}_3$ double bond

The C-C bond length of the following molecules are in the order-

1. ${\mathrm{C}}_2{\mathrm{H}}_6>{\mathrm{C}}_2{\mathrm{H}}_4>{\mathrm{C}}_6{\mathrm{H}}_6>{\mathrm{C}}_2{\mathrm{H}}_2$

2. ${\mathrm{C}}_2{\mathrm{H}}_2<{\mathrm{C}}_2{\mathrm{H}}_4<{\mathrm{C}}_6{\mathrm{H}}_6<{\mathrm{C}}_2{\mathrm{H}}_6$

3. ${\mathrm{C}}_2{\mathrm{H}}_6>{\mathrm{C}}_2{\mathrm{H}}_2>{\mathrm{C}}_6{\mathrm{H}}_6>{\mathrm{C}}_2{\mathrm{H}}_4$

4. ${\mathrm{C}}_2{\mathrm{H}}_4>{\mathrm{C}}_2{\mathrm{H}}_6>{\mathrm{C}}_2{\mathrm{H}}_2>{\mathrm{C}}_6{\mathrm{H}}_6$

An isomer of ethanol is-

The maximum number of carbon atoms arranged linearly in the molecule,  ${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{C}-\mathrm{CH}={\mathrm{CH}}_{\mathrm{2,}}$ are -

1. 3

2. 4

3. 5

4. 6

The IUPAC name of the above mentioned compound is - 

1. p-Phenyl diphenyl

2. p-1-biphenyl benzene

3.  1,1',4',1''-terphenyl

4. Terphenyl

The hydrocarbons having the lowest dipole moment among the following is:

1. 

2. CH₃ - C ≡ C - CH₃

3. CH₃ CH₂ CH = CH₂

4. CH₂ = CH - C ≡ CH