What Is the Approximate Chemical Shift of an Alkynyl Carbon

question 40

Multiple Choice

What is the approximate chemical shift of an alkynyl carbon in ¹³C NMR spectroscopy?

• A) 10 ppm
• B) 30 ppm
• C) 70 ppm
• D) 120 ppm
• E) 200 ppm

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Definitions:

Night Terrors

Intense episodes of panic and fear that occur during sleep, typically in children.

Stage 4 Sleep

Stage 4 sleep, now classified within N3 sleep in the modern sleep staging systems, is characterized by deep, restorative sleep and the presence of delta waves in brain activity.

Non-REM Sleep

A type of sleep that is divided into three stages, characterized by slow brain waves and reduced metabolic activity, distinct from REM (Rapid Eye Movement) sleep.

Sleepwalking

A disorder that causes people to get up and walk around while in a state of sleep.