3.6 Organic Analysis

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

How do we test for Alkenes ?

Back (Answer)

• Bromine Water • Add solution and then shake • Colour change from orange to colourless

Front (Question)

How do we test for a Haloalkane ?

Back (Answer)

Front (Question)

How do we test for an Alcohol ?

Back (Answer)

Front (Question)

How do we test for an Aldehyde ?

Back (Answer)

Front (Question)

How do we test for a Carboxylic Acid ?

Back (Answer)

Front (Question)

How does Infrared Spectrometry Work ?

Back (Answer)

Front (Question)

What is the IR Fingerprint region ?

Back (Answer)

Front (Question)

How can the Fingerprint region be used to detect impurities ?

Back (Answer)

by comparing the spectrum to the pure compound spectrum. Extra peaks show impurities.

Front (Question)

How does IR Absorption link with global warming ?

Back (Answer)

#10

Front (Question)

Back (Answer)

• Q, R, S, T • (Orange solution) turns green

#11

Front (Question)

Back (Answer)

• P, Q, R, S • Sweet smelling (liquid) • To react with (remove excess) acid / neutralise

#12

Front (Question)

Describe fully how infrared spectra can be used to distinguish between isomers R, S and T. Use data from Table A in the Data Booklet in your answer (4)

Back (Answer)

• R & S have an O-H alcohols peak at 3230-3550 cm−1 • T has C=O peak at 1680-1750 cm−1 • R & S (unique) fingerprint region or below 1500 cm−1 • Compare to a database / known spectra (and look for an exact match)

#13

Front (Question)

State why mass spectrometry using electrospray ionisation is not a suitable method to distinguish between the isomers (1)

Back (Answer)

All have the same Mr

#14

Front (Question)

Back (Answer)

• Named carbonate / hydrogencarbonate / bicarbonate (or Mg / Na) • No (visible/observed) reaction/change/effect • effervescence / bubbles (of gas) / fizzing

#15

Front (Question)

Back (Answer)

#16

Front (Question)

Back (Answer)

#17

Front (Question)

Back (Answer)

• Absorption at 1680–1750 cm−1 caused by C=O • No absorption at 1620−1680 cm−1 caused by C=C • No absorption at 3230–3550 cm−1 due to −OH (alcohol) • No absorption at 2500–3000 cm−1 due to −OH (acid)

#18

Front (Question)

Explain why determining the precise relative molecular mass of propanal and prop-2-en-1-ol by mass spectrometry could not be used to distinguish between samples of these two compounds (2)