What are alkanes, alkenes, and alkynes?

Answer 1

Before understanding each of these 3 types, you need to know that alkanes, alkenes & alkynes are hydrocarbons .

Hydrocarbons are organic compounds which only consist of carbon (#C#) and hydrogen (#H#) as their elements.
Alkanes are a group of acyclic, saturated hydrocarbons. These are contain carbon - carbon (#C-C#) single bonds. The single bond is made up of one #sigma# (sigma) bond. Their general formula is #C_nH_(2n+2)# . [Here, #n# stands for the number of carbon atoms]. Each atom has an #sp^3# hybridization in an alkane. The hydrogen atoms are always linked to a carbon atom.
#-># Examples : Methane (#CH_4#, where #n=1#); Butane* (#C_4H_10#)

Alkenes and alkynes are hydrocarbons that are unsaturated.

Unsaturated hydrocarbons are those in which you have atleast one carbon - carbon double bond (#C = C#), or atleast one carbon - carbon triple bond.
In the case of alkenes , they have atleast one carbon- carbon double bond. Their general formula is #C_nH_(2n)#. From the formula, you can notice that alkenes only have 2 #H# atoms lesser than the corresponding alkane. The carbon - carbon double (# C = C#) bond consists of one #sigma# and one #pi# (pi) bond.
# -># Examples : Ethylene (#C_2H_2#) or ethene; Pentene (#C_5H_10#).
Alkynes are unsaturated hydrocarbons which have atleast one carbon- carbon triple bond. Their general formula is #C_nH_(2n-2)#. You can see that these have 2 hydrogen atoms less than their corresponding alkane.
#-># Examples : Acetylene (called ethyne) i.e. #C_2H_2#; Propyne (#C_3H_4#).

I hope this is useful.

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Answer 2

Alkanes are saturated hydrocarbons consisting of only single bonds between carbon atoms. Alkenes are unsaturated hydrocarbons containing at least one carbon-carbon double bond. Alkynes are unsaturated hydrocarbons containing at least one carbon-carbon triple bond.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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