Question

question 8
what is the stretching frequency (in cm⁻¹) of the following carbonyl?
1745
1800
1715

Explanation:

Carbon - yl stretching frequencies depend on the nature of the carbon - yl compound. Acid chlorides have a characteristic carbon - yl stretching frequency around 1800 cm⁻¹ due to the electron - withdrawing effect of the chlorine atom which increases the double - bond character of the C=O bond and raises the stretching frequency.

Answer:

1800