Which of the following statements is correct

Which of the following statements is correct for alkyl halide?
a) Alkyl halide will always show SN1 mechanism
b) As branching at carbon increases, E1 mechanism is favoured as compared to SN1 mechanism
c) In unimolecular reaction, increasing the temperature donot favours E1 mechanism
d) In most unimolecular reactions of alkyl halide E1 reaction is favoured over SN1 reaction

Answer: b

Which of the following order is incorrect for the rate of E2 reaction?
a) 5-Bromocycloheptene > 4-Bromocycloheptene
b) 2-Bromo- I -phenylbutane > 3-Bromo- I-phenylbutane
c) 3-Bromocyclohexene > Bromocyclohexane
d) 3-Bromo-2-methylpentane > 2-Bromo-4-methylpentane

Answer: a