In the reaction,X and Y are from Chemistry NEET Year 2016 Free

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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41.

In the reaction,

straight H minus straight C identical to CH space rightwards arrow from left parenthesis ii right parenthesis space CH subscript 3 CH subscript 2 Br to left parenthesis straight i right parenthesis space NaNH subscript 2 divided by liq. NH subscript 3 of space straight X
space space space space space space space space space space space space space space space space space space straight X space rightwards arrow from left parenthesis ii right parenthesis space CH subscript 3 CH subscript 2 Br to left parenthesis straight i right parenthesis NaNH subscript 2 divided by liq. NH subscript 3 of space straight Y
X and Y are

  • X=2-butyne; Y= 3-hexyne

  • X=2-butyne;Y=2-hexyne

  • X=1-butyne ;Y = 2-hexyne

  • X=1-butyne ;Y = 2-hexyne


D.

X=1-butyne ;Y = 2-hexyne

NaNH2/liq.NH3 behaves as a base, so it abstracts a proton from acetylene to form acetylide anion followed by alkylation to give compound (X) i.e 1-butyne (X) further reacts with NaNH2/Liq NH3 followed by alkylation with ethyl bromide yields 3-hexyne (Y).

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42.

Consider the nitration of benzene using mixed conc. H2SO4 and HNO3. If a large amount of KHSO4 is added to the mixture, the rate of nitration will be

  • slower

  • uncharge

  • doubled

  • doubled

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43.

The correct statement regarding RNA and DNA, respectively is

  • The sugar component in RNA is ribose and sugar component in DNA is 2' deoxyribose

  • The sugar component in RNA is arabinose and the sugar component in DNA is ribose

  • The sugar component in RNA is 2'-deoxyribose and the sugar component in DNA is arabinose

  • The sugar component in RNA is 2'-deoxyribose and the sugar component in DNA is arabinose

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44.

Which one given below is a non - reducing sugar?

  • Lactose

  • Glucose

  • Sucrose

  • Sucrose

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45.

The product formed by the reaction of an aldehyde with a primary amine is

  • Ketone

  • Carboxylic acid

  • Aromatic acid

  • Aromatic acid

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