Question

explain what happens during partial hydrogenation of fats and oils that can make them particularly unhealthy, contributing to plaque formation and heart disease. partial hydrogenation is meant to convert some of the fatty acid double bonds (which are cis in naturally occuring fatty acids) to single bonds, but also converts some of the cis double bonds to trans. trans double bonds are shaped more like single bonds, allowing them to pack more easily and form arterial plaques. partial hydrogenation is meant to convert some of the fatty acid double bonds (which are trans in naturally occuring fatty acids) to single bonds, but also converts some of the trans double bonds to cis. cis double bonds are shaped more like single bonds, allowing them to pack more easily and form arterial plaques. partial hydrogenation is meant to convert some of the fatty acid double bonds (which are cis in naturally occurring fatty acids) to single bonds, but if there are any trans double bonds present to begin with, their bonds are broken, splitting the fatty acids into toxic byproducts.

Explanation:

Naturally - occurring fatty acids have cis - double bonds. Partial hydrogenation aims to convert some double bonds to single bonds. However, it also converts some cis - double bonds to trans - double bonds. Trans - double bonds have a linear shape (more like single - bonded chains) compared to the bent shape of cis - double bonds. This linear shape allows trans - fatty acids to pack more closely together, similar to saturated fats (which have single bonds). When they pack closely, they can contribute to plaque formation in arteries, increasing the risk of heart disease. Option B is incorrect because naturally - occurring fatty acids have cis - double bonds, not trans. Option C is incorrect as it misrepresents the process (trans double bonds are formed during partial hydrogenation from cis, not broken down into toxic by - products in the way described).

Answer:

A. Partial hydrogenation is meant to convert some of the fatty acid double bonds (which are cis in naturally occuring fatty acids) to single bonds, but also converts some of the cis double bonds to trans. Trans double bonds are shaped more like single bonds, allowing them to pack more easily and form arterial plaques.