The man tried to damage the face of the woman, who received burn injuries on her neck and hands in the incident, they said.
Accused Sachin Shigwan, who is unemployed, was arrested hours after he threw the inflammable chemical at 23-year-old victim while she was watching television at her neighbour's house in Wadarpada area of Kandivali this morning, police added.
The reason for the attack was that Shigwan, who also stays in the same locality, wanted to take revenge after the victim's husband had thrashed the accused on Sunday night for trying to create trouble between him and his wife, said a police officer at Samata Nagar police station.
According to police, the victim was sitting in her neighbour's house when the accused, carrying a bottle of chemical, sprayed it at her and simultaneously torched it with a lighter.
In a bid to save herself, she turned her face following which her neck, back and hands sustained burn injuries.
Her neighbour also sustained burn injuries on her hands when she tried to save the victim, police said, adding, the accused then escaped from the spot.
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The duo was rushed to nearby hospital where they are undergoing treatment and are out of danger.
A manhunt was launched for the accused, who was later traced from the same locality, police said.
Shigwan had been trying to severe the relationship between the couple, probably because he might have started liking the victim, police said.
According to police, a few months ago, Shigwan had started telephoning the couple individually and began spreading bad word against each other.
Furious over this, victim's husband had thrashed the accused on Sunday.