Statement (A): ${CH}_{3} - CH = CH - CH = CH - CH = {CH}_{2}$ is heptatriene.
Statement (B): ${CH}_{3} - C \equiv C - C \equiv CH$ is pentadiyne.
Statement (C): ${CH}_{3} - {CH}_{2}$ is ethyl group

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A, B are incorrect but C is correct

All statements A, B and C are incorrect

All statements A, B and C are correct

A, B are correct but C is incorrect

answer is A.

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Detailed Solution

The compound ${CH}_{3} - CH = CH - CH = CH - CH = {CH}_{2}$ has 7 carbons chain and 3 double bonds. The rootword is hept and primary suffix is “atriene” So that its name is heptatriene.

${CH}_{3} - C \equiv C - C \equiv CH$ has ‘5’ carbons and ‘2’ triple bonds. Hence, the root word is pent and primary suffix is “adiyne”. Therefore, the name of compound is “pentadiyne”. The given compound is ${CH}_{3} - {CH}_{2}$ -There is two carbon atoms are present. Hence, the root word is – eth and one hydrogen is removed from alkane. Therefore, the primary suffix name is –yl.