Acetyl acetone in enol form is more stable in polar aprotic solvents due to

Q. Enolic form of acetyl acetone is stabilised due to :

Q.

From: Acetone, Dimethsulfoxide, Dimethylformamide, water, HMPA, Ethanol, Acetic acid, DMA.

The number of polar aprotic solvent in the following solvents is ___.

Q. Assertion A: Enol form of acetone $\left[C{H}_{3}COC{H}_3\right]$ exists in $<0.1\%$ quantity. However, the enol form of the acetyl acetone $\left[C{H}_{3}COC{H}_{2}OCC{H}_3\right]$ exists in approximately $15\%$ quantity.
Reason R: Enol form of acetyl acetone is stabilized by intramolecular hydrogen bonding, which is not possible in enol form of acetone.
Choose the correct statement.

Q. Assertion :$S_{N}2$ reaction is carried out in the presence of polar aprotic solvent. Reason: Polar protic solvent increases the stability of carbocation due to solvation.

Q. The conversion of a keto form into enol is enolisation. It depends on structural factor, temperature and nature of solvent. Resonance and hydrogen bonding increases enol content. Enolic form of phenol is more stable than keto form by -13 kcal/mole of energy hence phenol exist exclusively as an enol. Enolic tautomer is less polar due to intramolecular hydrogen bonds than the corresponding keto form. Any polar solvent would decrease the enolisation and favour keto form intramolecular hydrogen bonding stablized enol form by 7kcal/mole and resonance stabilizes enol form by 15 kcal/mole.
The enol content of ethyl acetoacetate is maximum in :