Research Chemist Interview Questions and Answers for Freshers

NMR values for solvents are specific chemical shifts observed in nuclear magnetic resonance spectroscopy.

• NMR values for solvents refer to the chemical shifts observed in nuclear magnetic resonance spectroscopy.

• These values are used to identify and characterize solvents in chemical reactions.

• Common solvents and their NMR values include chloroform (7.26 ppm), acetone (2.22 ppm), and methanol (3.34 ppm).

Coupling reactions are chemical reactions that involve the formation of a covalent bond between two molecules.

• Coupling reactions involve the combination of two molecules to form a new compound.

• These reactions often require a catalyst to facilitate the bond formation.

• Coupling reactions can be used in organic synthesis to create complex molecules.

• Examples of coupling reactions include the Suzuki coupling, Heck reaction, and Sonogashira coupling.

Protecting amine compounds is important in organic synthesis to prevent unwanted reactions.

• A common method for protecting amines is to convert them into their corresponding amine salts.

• Another approach is to use protecting groups, such as Boc (tert-butyloxycarbonyl) or Fmoc (fluorenylmethyloxycarbonyl), which can be selectively removed later.

• Protecting amines can also be achieved by converting them into amides or carbamates.

• Care must be taken to choose a protecting group or m...read more

A pH meter is a scientific instrument used to measure the acidity or alkalinity of a substance.

• Calibrate the pH meter using buffer solutions before use

• Rinse the electrode with distilled water before and after each use

• Immerse the electrode in the solution being tested and wait for the reading to stabilize

• Read the pH value displayed on the meter

• Clean and store the pH meter properly after use