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Introduction to Alkanes

Name the alka...

Question

Name the alkane having $4$ carbon atoms and write the two distinct structural formulas of the same.

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Solution

The alkane having $4$ carbon atoms is butane. It has isomers n-butane and isobutane. Two distinct structural formulae are as shown.

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Write the molecular formula of (i) an alkane (ii) an alkene, and (iii) an alkyne, each having 20 carbon atoms.

Q. Write all the possible isomers of alkane having 7 carbon atoms and write their IUPAC names.

Q. Consider the following alkane and answer the following questions.

{({C H}_{3})}_{2} C H {C H}_{2} C H (C_{2} H_{5}) C H ({C H}_{3}) {C H}_{3}

(a) Write the complete structural formula of the alkane.
(b) What is its molecular formula?
(c) Write its bond line formula and give IUPAC name.
(d) How many methyl, methylene and methine groups are present in this alkane?
(e) How many ethyl and isopropyl groups are present in this alkane?
(f) How many carbon atoms are

1^{o}, 2^{o}, 3^{o}, 4^{o}

Q. (a) Give the name and structural formula of one member each of the following:
(i) alkane
(ii) alkene
(iii) alkyne
(iv) cycloalkane
(b) Give the common name of (i) ethyne, and (ii) ethene.
(c) Write the molecular formula and structure of benzene.

Q. (a) Give the general formula of alkanes. Write the name, structural formula and physical state of the compound containing:
(i) 3 carbon atoms
(ii) 8 carbon atoms

(b) Which of the compounds named in (a) would show :
(i) Isomerism
(ii) Higher melting point
(iii) Higher density
(v) Lower boiling point? [5 MARKS]

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