List of top Chemistry Questions on Redox reactions asked in CPET

During the standardisation of \(Na_2S_2O_3\) using \(K_2Cr_2O_7\) by the iodometric method, the equivalent weight of \(K_2Cr_2O_7\) is:

The following reaction is carried out:

A cyclopropane ring bearing a substituent R on one carbon and a nitro group (NO2) on the adjacent carbon reacts with ethylmagnesium iodide (\(C_2H_5MgI\)) to give A. What is the structure of A?