16 - Organic Analysis

Question 1

What is the test for a halogenoalkane?

Answer 1

Add warm aqueous NaOH
Acidify with HNO3
Add AgNO3

Precipitate of AgX

Question 2

What is the test for an alcohol?

Answer 2

Add acidified Kr2Cr2O7

Orange turns green with primary or secondary (or aldehydes)

Question 3

Give two tests for aldehydes.

Answer 3

Warm with Tollen’s
Silver mirror forms

Warm with Fehling’s
Blue goes red precipitate

Question 4

What is the test for a carboxylic acid?

Answer 4

Add aqueous NaHCO3
CO2 given off

Question 5

What is on the x axis of a mass spectrum?

Answer 5

mass/charge ratio

Question 6

What is the range of a fingerprint region?

Answer 6

Wavenumber < 1500cm-1

Question 7

What region is unique to an organic molecule? (infrared)

Answer 7

Fingerprint region

Question 8

How does infrared spectrometry work?

Answer 8

Identifies compounds based on changes in vibrations when they absorb IR of certain frequencies.

Bonds absorb infrared at specific frequencies.