Chemical Sciences Organic Reactive Intermediates

In the following dithiane, the correct statement about acidity of Ha and He protons and the reason for the stability of the carbanion formed by deprotonation is

1
Ha is more acidic; axial carbanion is delocalised into the σ orbital of C-S bond
2
He is more acidic; equatorial carbanion is delocalised into the σ orbital of C -S bond
3
Ha is more acidic; axial carbanion is delocalised into the empty 3d orbital of sulfur
4
He is more acidic; equatorial carbanion is delocalised into the empty 3d orbital of sulfur

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