CH₃CH=CHCH₃ + CHCl₃ + t-BuOK ➔ A. A is

In which of the following preparations of ether, the configuration about chiral centre is not retained?

Which ofthe following compounds is not chiral?

• 1-Chloropentane

• 2-Chloropentane

• 1-Chloro-2-methyl pentane

• 3-Chloro-2-methyl pentane

Which ofthe following molecules will not show optical activity?

Decreasing order of stability of ions is.
(i) CH₃ - $\stackrel{+}{\mathrm{C}}$H - CH₃

(ii) CH₃ - $\stackrel{+}{\mathrm{C}}$H - OCH₃

(iii) CH₃ - $\stackrel{+}{\mathrm{C}}$H - COCH₃

• (i) > (ii) > (iii)

• (ii) > (i) > (iii)

• (ii) > (iii) > (i)

• (iii) > (i) > (ii)

746.

Which of these compounds is synthesised by chloral?

• DDT

• BHC

• Chloroform

• Michlers ketone.

What is B ?

The function of AlCl₃, in Friedel-Craft's reaction is to

• absorb HCl

• absorb water

• produce nucleophile

• produce electrophile.

Consider the reaction,

The correct explanation is

• the product is formed due to nucleophilic substitution

• the product is formed according to Saytzeff's rule

• conjugated double bond product is formed, due to higher stability because of resonance stabilization

• (CH₃)₃CO^- is a better leaving group

Williamson's synthesis involves :

• S_N1 mechanism

• nucleophilic addition

• S_N2 mechanism

• S_E  mechanism