Which of the Following Statements Is True About Propyne, H-C≡C-CH₃

question 155

Multiple Choice

Which of the following statements is true about propyne, H-C≡C-CH₃?

• A) It contains a total of three sigma bonds.
• B) It contains a total of three pi bonds.
• C) The H-C≡C bond angle is about 109.5°.
• D) The C≡C-C bond angle is 180°.
• E) All carbon-carbon bonds are of equal length.

---

Definitions:

Direct Labor Efficiency Variance

A measure that analyses the variance between the actual hours worked and the standard hours set for producing a certain number of units.

Deadbolt Locks

A locking mechanism distinct from spring bolt lock, offering more security by requiring a key or knob to move the lock into the locked and unlocked positions.

Materials Quantity Variance

The difference between the actual and standard quantity of materials used times the standard price.

Materials Price Variance

The difference between the actual price and standard price of raw materials times the actual quantity used or purchased.