Which of the following compounds is an aldehyde? 
Definitions:
Performance Rating
An evaluation of an employee's job performance over a specific period, often affecting promotions, pay raises, and other employment decisions.
Allowance Factor
A numerical factor used in calculations to account for expected deviations or uncertainties in measurements or performance metrics.
Allowances
Amounts of money or discounts given for a specific purpose or as an adjustment, commonly used in budgeting and financial planning.
Time Studies
Time Studies involve the analysis and measurement of the time required to perform tasks and processes, aimed at identifying efficiencies and inefficiencies for optimization.
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