Which of the following statements is(are) about the IR spectrum of compounds I,

Question

Which of the following statements is(are) about the IR spectrum of compounds I, II, and III below? Compounds I shows absorptions in 2950 and 1700 cm^-1. Compounds II shows absorptions in 3200-3600 and 1650 cm^-1, Compounds III shows absorptions in 3200-3600 and 2950 cm^-1. Both (Compounds I shows absorptions in 2950 and 1700 cm^-1) and (Compounds II shows absorptions in 3200-3600 and 1650 cm^-1) are true. Which of the following statements is (are) true about the IR spectrum of the compounds drawn below? It shows absorptions at 3000-3150 cm^-1 and 1720 cm^-1. It shows absorptions at 3000-2850 cm^-1 and 2150 cm^-1. It shows absorptions at 2250 cm^-1 and 1650 cm^-1. It shows absorptions at 2250 cm^-1 and 1720 cm^-1. Both statements B (It shows absorptions at 3000-2850 cm^-1 and 2250 cm^-1) and D (It shows absorptions at 2250 cm^-1 and 1720 cm^-1) are true. A compound X has a molecular ion peak in its mass spectrum at m/z 136. What information does this tell us about X? X has a molecular mass of 136. The molecular formula for X is C)8H_8O_2. The empirical formula for X is C_4H_4O. Both A(X has a molecular mass of 136) and B(The molecular formula for X is)

Explanation / Answer

question 6.

answer is option D.

the compound I has carbonyl (C=O) str frequency at 1700 cm-1 and CH3 str at 2950 cm-1. Compound II has OH str frequency at 3200-3600 cm-1 and C=C str frequency at 1650 cm-1

question 7

answer is option D.

explanation: compound has CN functional group str frequency at 2250 cm-1 and C=O group str frequncy at 1720 cm-1

question 8

answer is option A.

molecular ion peak will give the information about molecular mass of the compound.

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