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The species which can best serve as an initiator for the cationic polymerization is :

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Toluene is nitrated and the resulting product is reduct is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then with cuprous bromide. The reaction mixture so formed contains

One ticket is selected at random from 50 tickets numbered 00, 01, 02, ... , 49. Then the probability that the sum of the digits on the selected ticket is 8, given that the product of these digits is zero, equals

In a shop there are five types of ice-creams available. A child buys six ice-creams.Statement -1: The number of different ways the child can buy the six ice-creams is $_{10}C_{5}$.Statement -2: The number of different ways the child can buy the six ice-creams is equal to thenumber of different ways of arranging 6 As and 4 Bs in a row.

The remainder left out when $8_{2n}(62)_{2n+1}$is divided by 9 is

Using MO theory predict which of the following species has the shortest bond length ?

If $∣z+4∣≤3$, then the maximum value of $∣z+1∣$ is

The $pK_{a}$ of a weak acid, HA, is 4.80. The $pK_{b}$ of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be

In the circuit below, A and B represent two inputs and C represents the output. The circuit represents