D

Which would be the most effective method to distinguish between liquid propan-1-ol and propan-2-ol?

A.     Observation of colour change when warmed with acidified potassium dichromate

B.     Determination of m/z value of molecular ion in the mass spectrum

C.     Determination of percentage composition

D.     ¹H NMR spectroscopy

D

Which compound gives this ¹H NMR spectrum?

A. CH₃CH₂OCH₂CH₃

B. CH₃CH₂OH

C. CH₃CH₂CH₃

D. CH₃CH₂CH₂OH

D

Which technique can be used to identify bond length and bond angle?

A.     ¹H NMR spectroscopy

B.     IR spectroscopy

C.     Mass spectroscopy

D.     X-ray crystallography

D

Which property explains why tetramethylsilane, Si(CH₃)₄, can be used as a reference standard in ¹H NMR spectroscopy?

A. It has a high boiling point.

B. It is a reactive compound.

C. All its protons are in the same chemical environment.

D. It gives multiple signals.

C

Which technique is used to determine the bond lengths and bond angles of a molecule?

A.     X-ray crystallography

B.     Infrared (IR) spectroscopy

C.     Mass spectroscopy

D.     ¹H NMR spectroscopy

A