One of the victims was said to have suffered "life-changing" injuries during one of the attacks, which were carried out by two male suspects on a moped.
Following the attack in Hackney Road, police said two men on a moped threw an abrasive chemical at a man in Islington at 10:49pm.
A 15-year-old boy and a 16-year-old boy were arrested on suspicion of robbery and grievous bodily harm.
They threw a noxious substance into his face before one of them jumped on to his moped and drove away. "I would urge businesses and parents to challenge those who they think may be trying to obtain or carry these substances as this could help prevent serious offences and life-changing injuries being caused".
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After one of the robberies in Hackney, a man was left with facial injuries described by police as life-changing.
London's Metropolitan Police say that corrosive liquid attacks rose to 454 in 2016 from 261 the year before.
The fourth incident was reported to the police at 11.37pm in Chatsworth Road. He had his moped stolen and his face sprayed with liquid.
'I am clear that life sentences must not be reserved for acid attack survivors, ' she wrote in the Sunday Times.
"People said he was attacked".
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The victim was taken to a hospital in east London. "It really is not", she said.
The Home Office said it would work with police and the Ministry of Justice to assess whether powers available to the courts, including sentencing, were sufficient. Some gave him water, some handed him a cloth, they were local people.
A similar incident on Cazenove Road near the junction with Upper Clapton Road was reported to police at 11:18 p.m.
Assaults involving acid and corrosive substances have more than doubled in England since 2012, with the number of acid attacks in the capital showing the most dramatic rise in the recent years.
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