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Chapter 22: Problem 3

Write the formula for (a) an alkene with two carbon atoms. (b) an alkane with 22 hydrogen atoms. (c) an alkyne with three carbon atoms.

Short Answer

Expert verified
Answer: (a) C2H4, (b) C10H22, (c) C3H4

Step by step solution

01

(a) Alkene with two carbon atoms

To write the formula for an alkene with two carbon atoms, we need to remember the general formula for alkenes, which is CnH2n. Here, n represents the number of carbon atoms in the alkene. Since the exercise asks for an alkene with two carbon atoms, we will have n=2. Replace n in the general formula with 2 and obtain the formula: C(2)H(2*2) = C2H4.
02

(b) Alkane with 22 hydrogen atoms

To determine the formula for an alkane with 22 hydrogen atoms, we should recall the general formula for alkanes, that is CnH(2n+2), where n is the number of carbon atoms. We are given that there are 22 hydrogen atoms, so we need to solve for n: (2n+2)=22. Now, subtract 2 from both sides of the equation and obtain: 2n=20. Finally, divide both sides by 2 to get: n=10. Knowing the number of carbon atoms, we can now write the formula for the alkane: C(10)H(2*10+2) = C10H22.
03

(c) Alkyne with three carbon atoms

To write the formula for an alkyne with three carbon atoms, it is necessary to remember the general formula for alkynes, that is CnH(2n-2), where n represents the number of carbon atoms. The exercise gives us an alkyne with three carbon atoms, so n=3. Replace n in the general formula with 3 and obtain the final formula: C(3)H(2*3-2) = C3H4.

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Most popular questions from this chapter

Which of the following can show optical isomerism? (a) 2-bromo-2-chlorobutane (b) 2 -methylpropane (c) 2,2-dimethyl-1-butanol (d) 2,2,4-trimethylpentane

Draw the structural isomers of the alkane \(\mathrm{C}_{6} \mathrm{H}_{14} .\)

Classify each of the following hydrocarbons as alkanes, alkenes, or alkynes. (a) \(\mathrm{C}_{6} \mathrm{H}_{14}\) (b) \(\mathrm{C}_{3} \mathrm{H}_{4}\) (c) \(\mathrm{C}_{9} \mathrm{H}_{18}\)

Write the structural formula of the ester formed by methyl alcohol with (a) formic acid. (b) acetic acid. (c) \(\mathrm{CH}_{3}-\left(\mathrm{CH}_{2}\right)_{6}-\mathrm{COOH}\).

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