Question

(a) Differentiate between alkanes and alkenes. Name and draw the structure of one member of each. (b) Alkanes generally burn with clean flame. Why ?

Answer 1

ALKANES
~Alkanes are those compounds which have at least 1 double bond
~These are saturated.
~ e.g. Methane,Ethane, etc.
H
|
H----C----H. Methane
|
H

ALKENES
~ These comlunds have at least 1 double bond.
~ These are unsaturated.
~ E.g. Methene, Ethene etc.

H=== C === H Methene

Alkanes burn with a clean flame because they have less quantity of carbon hence supply of oxygen is proper.
Hope it helps.

Answer 2

(i)  ALKANES

~Alkanes are those compounds which have at least 1 double bond

~These are saturated.

~ e.g. Methane,Ethane, etc.

       H

        |

H----C----H. Methane

        |

       H

ALKENES

~ These compounds have at least 1 double bond.

~ These are unsaturated.

~ E.g. Methene, Ethene etc.

H=== C === H Methene

(ii) Alkanes burn with a clean flame because they have less quantity of carbon hence supply of oxygen is proper.

Hope it helps......