Question

IUPAC name of CH2 = CH – CH(OH)C ≡ CH.

Answer 1

Answer:

Pentyn-3-ol

Explanation:

OH is an alcohol group. hence the suffix will be *ol*

Also Carbon atoms are 5 hence with triple bond hence parent will be *Pentyne*

and at the end by IUPAC naming nomenclature it will be either Pentynol or Pentyn-3-ol

Answer 2

IUPAC name of CH2=CH-CH(OH)C≡CH is Pent- 4- ene -1- ynol

• For the IUPAC name we will first see the Carbon Chain numbering (in which carbon number is more ) for that group or subgroup is preferred.

• Here OH group is preferred, But from left and right OH group's position is 3 so it will not work.

• Now Bond will matter and for triple bond preference is more so numbering will start from the triple bond and there we will mark 5 carbon atoms.

• Now prefix, word root and suffix are the main three things for IUPAC naming; C chain is used for prefix; subgroup is used for word root and suffix is used for leading group

• For the longest C chain prefix is pent; then 4 but we write ene for = and yne for ≡; alphabetical order should be followed then for OH we write ol

• vowel will be eliminated and our IUPAC name becomes Pent - 4 ene - 1 ynol

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