Chemistry Chapter on Alcohols and Phenols

Play an AI-generated podcast conversation about this lesson

What does the lack of a color change in litmus paper indicate about Alcohol A and the unknown alcohol?

The unknown alcohol is neutral

Alcohol A is a strong base

Both are weak acids or bases (correct)

Both are strong acids

What characteristic of the unknown alcohol may contribute to its insolubility in water?

High polarity of the -OH group

Presence of multiple hydroxyl groups

Presence of multiple carbon atoms (correct)

A low molecular weight

Which effect does the hydroxyl (-OH) group typically have on alcohol solubility?

It provides hydrophilic characteristics (correct)

It makes alcohols viscous

It decreases solubility in polar solvents

It increases solubility in non-polar solvents

How do strong acids interact with blue litmus paper?

It turns red Signup and view all the answers

What conclusion can be drawn about the acidity or basicity of the unknown alcohol based on litmus paper testing?

It is either a weak acid or a weak base Signup and view all the answers

What is the result of adding hydrochloric acid (HCl) to sodium phenoxide?

It causes more phenol to form. Signup and view all the answers

Which of the following reactions shows the formation of phenol from sodium phenoxide?

C6H5Na + HCl = NaCl + C6H5OH Signup and view all the answers

What is observed when iron (III) chloride is added to phenol?

An opaque white color turns violet. Signup and view all the answers

What inference can be made from the purple color change after adding iron (III) chloride to phenol?

Ferric phenol complex is produced. Signup and view all the answers

What happens to the concentration of sodium phenoxide in the presence of HCl?

It decreases as phenol is formed. Signup and view all the answers

Which chemical compound is obtained from the reaction of sodium phenoxide with hydrochloric acid?

Sodium chloride Signup and view all the answers

The final color observed after the iron (III) chloride test with phenol indicates what specific presence?

Presence of phenol Signup and view all the answers

What chemical formula represents the complex formed when phenol reacts with iron (III) chloride?

C6H5OFe12 Signup and view all the answers

What indicates that alcohol B is a secondary alcohol during the Iodoform test?

A color change from brown to light yellow Signup and view all the answers

What was the outcome when alcohols A and B were combined with the oxidizing agent?

Two distinct layers formed with an opaque top layer. Signup and view all the answers

Which of the following describes the initial color of the iodine solution before the test is performed?

Dark brown Signup and view all the answers

What happens after the addition of 5 drops of ethanol into one of the test tubes?

It forms an opaque yellow color Signup and view all the answers

What was observed when the unknown alcohol was tested with the oxidizing agent?

There was no observable reaction. Signup and view all the answers

What is the final color change observed in tube containing 2-methyl butan-2-ol during the Iodoform test?

From dark brown to opaque yellow Signup and view all the answers

What is the significance of the two distinct layers formed with the alcohols A and B?

It helps identify the alcohols as likely primary or secondary. Signup and view all the answers

What role does NaOH play in the Iodoform test?

It serves as a reagent to promote a color change Signup and view all the answers

Which temperature range was recommended for warming the test tubes in the water bath?

40 - 50°C Signup and view all the answers

What color change was specifically observed for alcohol labeled B?

It changed from dark green to a lighter shade. Signup and view all the answers

Which alcohol is specifically identified as ethanol during the iodoform test?

A secondary alcohol Signup and view all the answers

How is the presence of a methyl group significant in identifying alcohol B?

It confirms that alcohol B is likely a secondary alcohol Signup and view all the answers

What type of test is the Triodomethane (Iodoform) test primarily used to identify?

Secondary alcohols that contain a methyl group Signup and view all the answers

What can be inferred if no residue is found after burning alcohol in a crucible?

Complete combustion has occurred. Signup and view all the answers

What does the presence of a large orange flame and black smoke indicate during combustion?

Insufficient oxygen for combustion. Signup and view all the answers

Which of the following is the balanced equation for the combustion of butanol?

2C4H10 (l) + 13O2 (g) → 8 CO2 (g) + 10H2O (g) Signup and view all the answers

What is the significance of observing a small orange flame and no residue during the ignition of alcohol?

It suggests that high temperatures were achieved. Signup and view all the answers

What might be indicated by the presence of black or brown residue after burning a fuel?

Incomplete combustion due to lack of oxygen. Signup and view all the answers

Which observation is likely to indicate that a combustion reaction is not efficient?

A bright yellow flame. Signup and view all the answers

If a fuel produces only carbon dioxide and water upon combustion, what can be concluded?

Complete combustion occurred. Signup and view all the answers

Which statement best explains why black smoke is produced during combustion?

The fuel is burning at a low temperature. Signup and view all the answers