Which combination of carbonyl compound and organometallic reagent would give the compound shown? 
Definitions:
Internal Control System
A process implemented by management and other personnel to provide reasonable assurance regarding the achievement of objectives in effectiveness and efficiency of operations, reliability of financial reporting, and compliance with laws and regulations.
Purpose
The reason for which something is done or created, or for which something exists.
Voucher System
An accounting system that involves preparing and approving vouchers before transactions are recorded and payments made, to ensure financial controls.
Control Procedures
Measures and policies implemented by a company to ensure the integrity of financial and accounting information and compliance with laws and regulations.
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