Would 4-bromoacetanilide or 4-bromo-2-chloroacetanilide be more reactive toward electrophilic substitution? explain.

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4-Bromoacetanilide will be more reactive toward electrophilic substitution than 4-bromo-2-chloroacetanilide .

Explanation: -

Electrophilic substitution depends on the electron density of the aromatic ring. More the electron density, more is the reactivity.

Chloro is a electron withdrawing group. So it reduces the electron density of the aromatic benzene ring, thus decreasing the electron density.

Thus, 4-Bromoacetanilide will be more reactive toward electrophilic substitution than 4-bromo-2-chloroacetanilide.

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied