1)

Identify Z in the following reaction  sequence

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A) CH3CH(NH2)CN2NH2

B) CH3CHOHCH2OH

C) CH3C(OH)=CH2

D) CH3CCH

Answer:

Option D

Explanation:

CH3CH2CH2OH    conc.H2SO416001800C       CH3CH=CH2  Br2alc.KOH         CH3CHBrCH2Br 

                         (Y)

[CH3C(Br)=CH2+CH3CH=CHBr]   NaNH2HBr      CH3CCH

    (A)    (B)                                                                                        (Z)

 Alcoholic KOH brings about dehydrobromination of Y and give a mixture of vinyl bromide (A and B) while 
NaNH2 being a strong base than alc . KOH readily  brings about dehydrobromination of less reactive vinyl bromide to give propyne  CH3CCH  i.e, (Z)