Tag: chemistry

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Questions Related to chemistry

Multiple choice chemistry organic nitrogen compounds nitroarenes- preparation and properties nitro compounds types of organic reactions

Nitrobenzene is used for making aniline, an important chemical used in:

  1. the making of glue

  2. the dyeing industry

  3. the crimping of wool

  4. fast-drying varnish
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Consisting of a phenyl group attached to an amino group, aniline is the prototypical aromatic amine. Its main use in dyeing industry is as a precursor to indigo, the blue of blue jeans.
Multiple choice chemistry organic nitrogen compounds nitroarenes- preparation and properties nitro compounds types of organic reactions

A compound X of formula $\displaystyle C _{2}H _{5}NO _{2}$ on treatment with $\displaystyle (HNO _{2}+HCl)$ gives off an inactive gas Y and form Z when heated with soda lime X gives A $\displaystyle (CH _{5}N)$ soluble in acid Find the true statements among the following.

  1. A answers carbylamine test

  2. X is an amino acid
  3. Y is $\displaystyle CO _{2}$

  4. Z is a hydroxyl acid
Reveal answer Fill a bubble to check yourself
B,D Correct answer
Multiple choice chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

Which of the following aldehyde is very much used in perfumery and in dye industries?

  1. Formaldehyde

  2. Acetaldehyde

  3. Benzaldehyde

  4. Butyraldehyde
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Benzaldehyde is much used perfumery industries because it has bitter almond odor and also it is used for making aniline dye.
Multiple choice chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

Which of the following does not uses formaldehyde in its preparation?

  1. Melamine polymer

  2. Bakelite

  3. PHBV

  4. preservation of biological specimens
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Formaldehyde is not used in the preparation of PHBV. PHBV is a thermoplastic polymer. The monomers, 3-hydroxybutanoic acid and 3-hydroxypentanoic acid, are joined by ester bonds; the back bone of the polymer is made up of carbon and oxygen atoms.

Multiple choice chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

A major constituent of vinegar is:

  1. Methanoic acic

  2. Benzoic acid

  3. Ethanoic acid

  4. Picric acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The main constituent of vinegar is acetic acid. The other constituents will depend on the nature of the raw material that has undergone fermentation.

Hence, option $C$ is correct.