Which of the following species is the conjugate acid of the hemiacetal formed by reaction of benzaldehyde with methanol containing a trace of acid ? (a) (b) (c) (d)

Benzaldehyde is an aromatic aldehyde and methanol is an alcohol. The reaction of formation of hemiacetal of these two is given as- Thus, the hemiacetal formed is PhCH(OH)(OMe) and its conjugate acid is formed by adding a proton to the R i.e. Me here. Therefore, the correct answer is option (c)