Question

Match the following compounds in Column-I with their uses in Column-II: \[ \begin{array}{llll} (a) & \text{Acetophenone} & (p) & \text{Manufacture of acetic acid} \\[6pt] (b) & \text{Benzaldehyde} & (q) & \text{Preparation of Bakelite} \\[6pt] (c) & \text{Ethanal} & (r) & \text{Preparation of perfumes} \\[6pt] (d) & \text{Methanal} & (s) & \text{To increase good odour and flavour} \end{array} \]

• A. \((a)-(r),\ (b)-(s),\ (c)-(q),\ (d)-(p)\)
• B. \((a)-(s),\ (b)-(r),\ (c)-(p),\ (d)-(q)\)
• C. \((a)-(q),\ (b)-(r),\ (c)-(s),\ (d)-(p)\)
• D. \((a)-(q),\ (b)-(s),\ (c)-(r),\ (d)-(p)\)

Hint:

Important industrial uses: \[ \text{Acetophenone} \rightarrow \text{Perfumes and flavouring agents} \] \[ \text{Benzaldehyde} \rightarrow \text{Perfumes and fragrances} \] \[ \text{Ethanal} \rightarrow \text{Manufacture of acetic acid} \] \[ \text{Methanal} \rightarrow \text{Preparation of Bakelite resin} \]

Answer 1

The Correct Option is B

Concept: Many aldehydes and ketones are used in perfume, flavouring and polymer industries due to their characteristic odours and reactivity.

Step 1: Match Acetophenone and Benzaldehyde. \[ \text{Acetophenone} \rightarrow \text{Used in perfumes and flavouring agents} \] \[ (a)\rightarrow(s) \] \[ \text{Benzaldehyde} \rightarrow \text{Used in perfume industry} \] \[ (b)\rightarrow(r) \]

Step 2: Match Ethanal and Methanal. Ethanal is readily oxidized to acetic acid and is used in its manufacture. \[ (c)\rightarrow(p) \] Methanal (formaldehyde) reacts with phenol to produce Bakelite resin. \[ (d)\rightarrow(q) \] Thus, \[ (a)-(s),\quad (b)-(r),\quad (c)-(p),\quad (d)-(q) \] \[ \boxed{(a)-(s),\ (b)-(r),\ (c)-(p),\ (d)-(q)} \] Hence, option \(\mathbf{(B)}\) is correct.