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(D) conjugate acid is formed when a base accepts a proton $(H^+)$.Compound $(A)$ is $4$-aminocyclohexan-$1$-ol,which contains two basic sites: the ami

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Both $(A)$ and $(B)$

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(D) conjugate acid is formed when a base accepts a proton $(H^+)$.Compound $(A)$ is $4$-aminocyclohexan-$1$-ol,which contains two basic sites: the amino group $(-NH_2)$ and the hydroxyl group $(-OH)$.$1$. The nitrogen atom in the $-NH_2$ group has a lone pair of electrons,making it a Lewis base. It can accept a proton to form the ammonium ion $(-NH_3^+)$.$2$. The oxygen atom in the $-OH$ group also has lone pairs of electrons and can be protonated in the presence of a strong acid to form the oxonium ion $(-OH_2^+)$.Therefore,both the protonated nitrogen species and the protonated oxygen species are conjugate acids of $(A)$.

The conjugate acid of $(A)$ is

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