Question

If n=2

Name?
b.Molecular formulas

Answer 1

Answer:

Helium

Explanation:

n means Atomic number

Answer 2

Answer:

In chemistry, hydrocarbons are basically of 4 categories:

• Alkanes.
• Alkenes.
• Alkynes.
• Aromatic hydrocarbons.

Explanation:

There are 4 categories of hydrocarbon as follows:

• Alkanes.
• Alkenes.
• Alkynes.
• Aromatic hydrocarbons.

The General formula for Alkanes, Alkenes, Alkynes are as follows:

Alkanes: They are saturated hydrocarbons and have a single bond in them, their formula is $CnH2n+2$

Alkenes: They are unsaturated hydrocarbons and have double bonds in them, their formula is $CnH2n$

Alkynes: They are also unsaturated hydrocarbons and have triple bonds in them, their formula is $CnH2n-2$

Here, n is the number of carbon atoms so if ( n = 2 ).

then,

Alkanes: $CnH_{2n+2}$ = $C_{2} H_{2} *_{2} +_{2}$ = $C_{2} H_{6}$  = Ethane

Alkenes: $C_{n} H_{2n}$ = $C_{2} H_{2*2}$ = $C_{2} H_{4}$ = Ethene

Alkynes: $C_{n} H_{2n-2}$ = $C_{2} H_{2*2-2}$ = $C_{2} H_{4-2}$ = $C_{2} H_{2}$ = Ethyne.

For more information see:

https://brainly.in/question/27573392

https://brainly.in/question/8679814