AQA AS Chemistry C16 Organic Analysis Kerboodle Answers

Banner 1 C16.1 Test tube reactions  AQA AS Chemistry C16  Organic Analysis: Page No. 242

1.Ans-

Silver nitrate solution can be used to find out which halogen is present in a suspected halogenoalkane. The most effective way is to do a substitution reaction which turns the halogen into a halide ion, and then to test for that ion with silver nitrate solution.

2.Ans-

A.To remove any CO₃^2- or OH^–ions present which would also form a precipitate.

B. This would form a precipitate of AgCI.

3.Ans-

a .Alkaline and carboxylic add

16.2 Mass spectrometry AQA AS Chemistry C16  Organic Analysis: Page No. 244

1.Ans-

 a.A solution of the molecules passes through a positively charged hollow needle.

b. Positive

2.Ans- C₁₀H₁₆

16.3 Infrared spectroscopy AQA AS Chemistry C16  Organic Analysis: Page No. 249

1.Ans-

This IR peak h caused by C=0 which b present in both a and b but not c

2.Ans- B or c

4.Ans-

This IR peak is caused by O-H which is present in b and c but not a.

5.Ans-b

6.Ans-

This compound has both c = o and O-H.

Practice questions: Page No. 250-251

1.Ans-

 {a)Absorption X: (O–H) (alcohols)

Absorption Y: C=O

2.Ans-

(a) Functional group (isomerism)

(c) (Both have) C=O OR a carbonyl (group)

d) (i) (Free-) radical substitution only

(ii)

A termination step lo form a molecule with the empirical formula C₃H₇(4 marks)

(e

Mr = 44.063#52 (for propane)

Mr = 43.989#82 (for carbon dioxide)

M1 a correct value for both of these Mr values.

M2 a statement or idea that two peaks appear (in the mass spectrum) OR two molecular ions are seen (in the massspectrum).

3.Ans-

a) Pentan-2-one

(b) Functional group (isomerism)

(ii)

No (free) rotation (about the C=C)

(i)

Spectrum is for Isomer 1

or named or correctly identified

(ii)

If Isomer 1 is correctly identified, award any two from

 (Strong / broad) absorption / peak in the range 3230 to 3550#cm-1 or specified value in this range or marked correctly on spectrum and (characteristic absorption / peak for) OH group /alcohol group

 No absorption / peak in range 1680 to 1750#cm-1 or absence marked correctly on spectrum and (No absorption / peak for a) C=O group / carbonyl group / carbon-oxygen double bond

 Absorption / peak in the range 1620 to 1680#cm-1 or specified value in this range or marked correctly on spectrum and(characteristic absorption / peak for) C=C group / alkene / carbon-carbon double bond.

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