The correct name for is :-

2 - H y d r o x y c y c l o p e n t a n - 1 - a l

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2 - F o r m y l - 1 h u d r o x y c y c l o p e n t a n e

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2 - H y d r o x y c y c l o p e n t a n e c a r b a l d e h y d e

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C y c l o p e n t a n e - 2 - o l - 1 - a l

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Solution

The correct option is A $2 - H y d r o x y c y c l o p e n t a n - 1 - a l$

Rules for Naming Hydrocarbons:-

Rule-I Selection of the longest carbon chain.

Rule-II Numbering the longest chain: Longest chain is numbered starting from a terminal carbon. Numbering is done is such a way that lowest possible number is given to the side chain or a functional group.

Rule-III Writing names of branched, saturated hydrocarbons, locants are written first in alphabetical order followed by name of parent chain.

Rule-IV Some common names are retained in $I U P A C$ system for unsubstituted hydrocarbon only.

Order of numbering:- $- C H O > - O H$ (preference)
(Refer to Image)
$⟶$ Ring is $5$ membered.
$⟶$ functional group is aldehyde.
$⟶$ at $2^{n d}$ position $- O H$ group.
So, the name of the given compound is $2 - h y d r o x y$ $c y c l o p e n t a n - 1 - a l$ .

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