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Verdich [7]
3 years ago
7

An unknown compound X has the empirical formula C3H6O and a molecular ion peak in its mass spectrum at m/z 116. X shows no IR ab

sorption at 3200-3600 cm^-1 but shows a peak at 1740 cm^-1. The H NMR spectral data of X is shown below. What is the most likely structure of X? 22. An unknown compound X has the molecular formula C6H14O. X shows a strong peak in its IR spectrum at 3000 cm^-1. The 1H NMR spectral data of N are given below. What is the most likely structure of X?
Absorption ζ H ratio
triplet 1.0 3
double 1.0 6
quartet 2.0 2
septet 3.5 1
Chemistry
1 answer:
Vlad [161]3 years ago
3 0

Answer:

Explanation:

For an unknown compound whose empirical formula is C3H6O, the atomic no= 58, and since mass spectrum possesses a molecular ion at 116, then the twice amount of the empirical formula is called the molecular formula.

The degree of unsaturation pf C6H12O2 = 6 - (12/2) + 1

= 6 - 6 + 1

= 1 double bond or ring

Similarly, the IR shows a peak at 1740 cm⁻¹. This showcases the presence of a carbonyl group

Following the 1 HNMR data;

At 1.0 ppm, triplet 3H --> a methyl group is next to a CH2

At 1.2 ppm, doublet, 6H --> two methyl groups are next to a CH(isopropyl group)

At 2.0 ppm, quartet 2H --> CH2 next to the methyl group at 1.0 ppm

At 3.5 ppm, septet 1H  --> CH group of the isopropyl group

The presence of the two oxygen also gives a hint that the structure seems to be an ester called isopropyl propionate.

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  • <u>1. Equation: 2x  + 3 = 9x - 11</u>

<u></u>

  • <u>2. Each row has 2 chairs</u>

Explanation:

The variable x represents the number of chairs in each row.

<u />

<u>1. She can form 2 rows of a given length with 3 chairs left over.</u>

Thus, she has:

number of rows  number of chairs in      chairs             number of chairs

                             each row                       left over         she has

     2                        x                                    3                      2x + 3

<u>2.  She can form 9 rows of the same length if she gets 11 more chairs.</u>

That means that she is short in 11 chairs to have 9x chairs, or that she has 11 less chairs than 9x chairs. Then she has:

  • 9x - 11

<u>3. Equation:</u>

Then, number of chairs she has is 2x + 3 and, also, 9x - 11, which allows to set the equation:

  • 2x + 3 = 9x  -11

<u>4. Solve the equation:</u>

  • 9x - 2x = 3 + 11
  • 7x = 14
  • x = 2

Therefore, each row has 2 chairs, and she has 2x + 3 = 4 + 3 = 7 chairs.

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3 years ago
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