The following characteristic peaks were observed in the infrared spectrum of an organic compound having the formula $C_2H_6O$ .

(a) Strong band at 3300 $\mathrm{cm}^{–1}\quad$ (b) Band at 2965 $\mathrm{cm}^{–1}$

(c) Band at 2920 $\mathrm{cm}^{–1}\quad \quad \quad \quad$ (b) Band at 1050 $\mathrm{cm}^{–1}$

Name the compound.

Question

The following characteristic peaks were observed in the infrared spectrum of an organic compound having the formula [latex]C_2H_6O[/latex].

(a) Strong band at 3300 [latex]\mathrm{cm}^{–1}\quad[/latex] (b) Band at 2965 [latex]\mathrm{cm}^{–1}[/latex]

(c) Band at 2920 [latex]\mathrm{cm}^{–1}\quad \quad \quad \quad[/latex] (b) Band at 1050 [latex]\mathrm{cm}^{–1}[/latex]

Name the compound.

Accepted Answer

• Peak at 3300 [latex]\mathrm{cm}^{–1}[/latex] indicates the presence of –OH group.

• Strong band at 1050 [latex]\mathrm{cm}^{–1}[/latex] confirms the presence of primary alcoholic group.

• Band at 2965 and 2920 [latex]\mathrm{cm}^{–1}[/latex] may be due to C–H stretching.

Hence the compound contains a primary alcoholic group. As the molecular formula is [latex]C_2H_6O[/latex] , the structure of the given compound is [latex]CH_3CH_2OH[/latex] (ethyl alcohol).

Question 17.4.2: The following characteristic peaks were observed in the infr......

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