Consider the following reaction:H-CHO-(CH_2)_ | vedclass

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(B) The reaction involves the nucleophilic attack of the hydroxyl $(-OH)$ group on the carbonyl $(C=O)$ carbon of the same molecule in the presence of

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intramolecular hemiacetal formation

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(B) The reaction involves the nucleophilic attack of the hydroxyl $(-OH)$ group on the carbonyl $(C=O)$ carbon of the same molecule in the presence of an acid catalyst $(H^+)$.Since the $-OH$ group and the $C=O$ group are present in the same molecule,the cyclization is an intramolecular process.The product formed is a hemiacetal because it contains both an $-OH$ group and an $-OR$ group attached to the same carbon atom.Therefore,the reaction is an example of intramolecular hemiacetal formation.

Consider the following reaction:
$H-CHO-(CH_2)_4-OH \xrightarrow{H^+} \text{Cyclic product}$
The above reaction is an example of:

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Consider the following reaction:$H-CHO-(CH_2)_4-OH \xrightarrow{H^+} \text{Cyclic product}$The above reaction is an example of: