Introduction to Alkanes

Q. Saturated hydrocarbon contain
only single bonds whereas
unsaturated hydrocarbons contain
only double bonds.

1. True
2. False

Q. What is name of group by which successive member in the homologues series of alkane differ from each other ?

1. Alcohol
2. Ketone
3. Amine
4. Methylene

Q. Why are alkane called as paraffins?

1. Little affinity towards a general reagent
2. Alkanes are inert substances
3. They are highly polar in nature.
4. (a) and (b) above.

Q.

The octane number has zero value for

1. N-Octane

2. N-Heptane

3. Iso-Octane

4. Tetraethyl Lead

Q.

Which of the following gives CH₄ on hydrolysis?

1. Fe₃O₄

2. Al₂O₃

3. Al₄C₃

4. CaC₂

Q. The parent chain is:

1. Octane
2. Nonane
3. Hexane
4. heptane

Q.

Which represents an alkane

1. $C_5{H}_8$

2. $C_8{H}_6$

3. $C_9{H}_{10}$

4. $C_7{H}_{16}$

Q. How many primary, secondary, tertiary and quaternary carbons are present in the following hydrocarbon?
$C{H}_3-CH\left(C{H}_3\right)-C(C{H}_3{)}_2-C{H}_2-CH(C{H}_3)-C{H}_2-C{H}_3$

$\begin{array}{ccccc}& \text{Primary}& \text{Secondary}& \text{Tertiary}& \text{Quaternary}\\ \text{a)}& \text{6}& \text{2}& \text{2}& \text{1}\\ \text{b)}& \text{2}& \text{6}& \text{3}& \text{0}\\ \text{c)}& \text{2}& \text{4}& \text{3}& \text{2}\\ \text{d)}& \text{2}& \text{2}& \text{4}& \text{3}\end{array}$

1. a
2. b
3. c
4. d

Q.

Number of chain isomers of $C_6{H}_{14}$ are:

1. 3

2. 4

3. 5

4. 6

Q.

In alkane the bond angle is

1. ${109.5}^{\circ }$

2. ${105}^{\circ }$

3. ${120}^{\circ }$

4. ${180}^{\circ }$

Q.

Number of chain isomers of $C_6{H}_{14}$ are:

1. 3

2. 4

3. 5

4. 6

Q. The correct IUPAC name of the following compound is:

1. 2-bromo-4-cyclobutyl-1-cyclopropyl benzene
2. 1-bromo-5-cyclobutyl-2-cyclopropyl benzene
3. 3-bromo-1-cyclobutyl-4-cyclopropyl benzene
4. 1-bromo-2-cyclopropyl-5-cyclobutyl benzene

Q.

Which of the following isomerism is shown by alkanes?

1. Chain

2. Functional

3. Tautomerism

4. Conformational

Q.

LPG is a mixture of

1. $C_6{H}_{12}+C_6{H}_6$

2. $C_4{H}_{10}+C_3{H}_8$

3. $C_2{H}_4+C_2{H}_2$

4. $C_2{H}_4+C{H}_4$

Q. Methane gives water gas when heated with steam in presence of

1. $Cu$
2. $Ni$
3. $Zn$
4. $Al$

Q. How many primary, secondary, tertiary and quaternary carbons are present in the following hydrocarbon?
$C{H}_3-CH\left(C{H}_3\right)-C(C{H}_3{)}_2-C{H}_2-CH(C{H}_3)-C{H}_2-C{H}_3$

$\begin{array}{ccccc}& \text{Primary}& \text{Secondary}& \text{Tertiary}& \text{Quaternary}\\ \text{a)}& \text{6}& \text{2}& \text{2}& \text{1}\\ \text{b)}& \text{2}& \text{6}& \text{3}& \text{0}\\ \text{c)}& \text{2}& \text{4}& \text{3}& \text{2}\\ \text{d)}& \text{2}& \text{2}& \text{4}& \text{3}\end{array}$

1. a
2. b
3. c
4. d

Q. What is the molecular formula of heptane and ethane respectively?

1. $C_7{H}_{16},C_2{H}_6$
2. $C_7{H}_{14},C_2{H}_6$
3. $C_7{H}_{16},C_2{H}_4$
4. $C_7{H}_{14},C_2{H}_4$

Q.

Which represents an alkane

1. $C_5{H}_8$

2. $C_8{H}_6$

3. $C_9{H}_{10}$

4. $C_7{H}_{16}$