Unsaturated Hydrocarbons

Q.

How many pair(s) of electrons are shared between the two carbon atoms in an ethene molecule?

1. 3

2. 4

3. 1

4. 6

Q. Write first five members of homologous series of aldehydes.

Q. The general formula for alkynes is:

1. ${\text{C}}_{\text{n}}{\text{H}}_{2\text{n}+2}$
2. ${\text{C}}_{\text{n}}{\text{H}}_{\text{n}}$
3. ${\text{C}}_{\text{n}}{\text{H}}_{2\text{n}-2}$
4. ${\text{C}}_{\text{n}}{\text{H}}_{2\text{n}}$

Q. Carbon shows some unique properties, name them.

Q. Pentene has ______ numbers of hydrogen and cyclopentane has ______ numbers of hydrogens.

1. 10, 10
   
2. 12, 10
   
3. 12, 12
4. 10, 12
   

Q. Structural isomers are compounds having the same molecular formulae but different structures.

1. False
2. True

Q.

What is the ratio of hydrogen atoms present in heptyne to that in butene?

1. $\frac{3}{2}$

2. $\frac{7}{4}$

3. $\frac{5}{2}$

4. $\frac{6}{5}$

Q. Structural isomers are compounds with same molecular formula and different structures but the same number of carbon atoms are present in the parent chain.

1. True
2. False

Q.

If the number of hydrogen atoms in an alkene is 16, then what is the name of this hydrocarbon compound?

1. Hexene

2. Octene

3. Heptene

4. Decene

Q. Match the given chemical compounds with their respective functional group family.

Column A	Column B
$C{H}_3-C{H}_2-C{H}_2-O-C{H}_3$	Alcohol
${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{COOH}$	Ether
${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{Cl}$	Haloalkane
${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{OH}$	Carboxylic Acid

Q.

1. 2-cyano-3-oxopentanal
2. 2-formyl-3-oxopentanenitrile
3. 2-cyanopentane-1, 3-dione
4. 1, 3-dioxo-2-cyanopentane

Q. The general formula for alkynes is:

1. ${\text{C}}_{\text{n}}{\text{H}}_{2\text{n}+2}$
2. ${\text{C}}_{\text{n}}{\text{H}}_{\text{n}}$
3. ${\text{C}}_{\text{n}}{\text{H}}_{2\text{n}-2}$
4. ${\text{C}}_{\text{n}}{\text{H}}_{2\text{n}}$

Q. Which is the strongest bond in the given compound?

1. 1
2. 2
3. 3
4. 4

Q. The general formula for alkynes is:

1. ${\text{C}}_{\text{n}}{\text{H}}_{2\text{n}-2}$
2. ${\text{C}}_{\text{n}}{\text{H}}_{2\text{n}+2}$
3. ${\text{C}}_{\text{n}}{\text{H}}_{2\text{n}}$
4. ${\text{C}}_{\text{n}}{\text{H}}_{\text{n}}$

Q. If a hydrocarbon contains 4 carbon atoms then how many different arrangements of carbon skeletons are possible?

1. 3
2. 2
3. 4
4. 5

Q. The general formula for alkynes is:

1. ${\text{C}}_{\text{n}}{\text{H}}_{2\text{n}-2}$
2. ${\text{C}}_{\text{n}}{\text{H}}_{2\text{n}+2}$
3. ${\text{C}}_{\text{n}}{\text{H}}_{2\text{n}}$
4. ${\text{C}}_{\text{n}}{\text{H}}_{\text{n}}$

Q. Structural isomers are compounds having the same molecular formulae but different structures.

1. False
2. True

Q. Calculate the number of hydrogens present in an alkane, containing 15 carbons atoms. [2 marks]

Q. If a hydrocarbon contains 4 carbon atoms then how many different arrangements of carbon skeletons are possible?

1. 5
2. 3
3. 4
4. 2

Q. If a hydrocarbon contains 4 carbon atoms then how many different arrangements of carbon skeletons are possible?

1. 3
2. 2
3. 4
4. 5

Q. What is the IUPAC name of the following alkene?
$C{H}_2=CH-CH(C{H}_3{)}_2$

1. Isopropyl ethylene
2. Isopentene
3. 3-Methylbut-1-ene
4. 2-methylbut-3-ene

Q.

The organic compounds having the same molecular formula but different structures are known as ..........

1. Isomers

2. Isotopes

3. Isotones

4. Isobars

Q. Structural isomers are compounds having the same molecular formulae but different structures.

1. False
2. True

Q. Structural isomers are compounds having the same molecular formulae but different structures.

1. False
2. True

Q. Structural isomers are compounds having the same molecular formulae but different structures.

1. True
2. False