What type of molecule is shown below?
A. Alkyne
B. Alkene
C. Alkane
D. Aromatic

The diagram represents the molecule Alkene with the correct option B.

ALKENES are hydrocarbons which contains at least one double bond between the carbon atoms in the molecule. They have the general molecular formula of CnH2n;where, n is a positive whole number which is equal to or greater than 2.

They contain two hydrogen atoms less than the alkanes. This is because, unlike the alkanes which are saturated compounds, the alkenes are unsaturated compounds which contain a carbon-carbon double bond in their molecular structures.

Alkenes take their names by changing the -ane of the corresponding alkane to -ene, for example ethane to ethene; propane to propene; butane to butene and so on.

ALKENES undergo both substitution and addition reactions. The latter helps in breaking the double bond and hence bestowing saturation unto the compound. ALKENES can be used for the following:

The first member of the alkenes is ethene and this is illustrated in the attached diagram.

Therefore the diagram shown in the question is an ALKENE. The correct option is B.

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the answer is c.the valence of the atoms combine .