Question

Choose the correct reagents used in the conversion.

	p	q	r	s
(a)	$Br_2$	alc. $KOH$	$NaOH$	$Al_2O_3$
(b)	$HBr$	alc. $KOH$	$CaC_2$	$KMnO_4$
(c)	$HBr$	alc. $KOH$	$NaNH_2$	red hot iron tube
(d)	$Br_2$	alc. $KOH$	$NaNH_2$	red hot iron tube

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (D)

$CH _{2}= CH _{2} \xrightarrow{Br _{2}} \underset{\text { Electrophilic addition reaction }}{ CH _{2} Br - CH _{2} Br} \xrightarrow{\text { alc. } KOH } \underset{\text{Elimination reaction}}{CH _{2}= CHBr} \xrightarrow{ NaNH _{2}}CH \equiv CH$
$\Rightarrow \underset{\text{under the influence of a organometallic Nickel catalyst at 873 K}}{3 CH \equiv CH \xrightarrow{\text { red hot iron tube }}C _{6} H _{6}}$