NEET UG CHEMISTRY MCQ: HYDROCARBONS

1 Medium

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Hex – 2 – yne changes to hex – 1 – yne by using

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Correct option: A

NaN{H_2}/{H_2}O

Option A (

NaNH_2/H_2O

) is correct because it provides a strong base to deprotonate the terminal alkyne and then reprotonate it at the desired position, shifting the triple bond.

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The reaction of alkanes with halogen is explosive in the case of: A mixture of sodium benzoate and soda lime on heating produces The major product of the following reaction is

C{H_3}C \equiv CH\xrightarrow[{(ii)\;DI}]{{(i)\;DCl\;(1\;equiv.)}}

S-I : Heavy metal acetylides can be used to purify alkynes
S-II: Terminal alkynes form acetylides which are soluble in acids. Select the incorrect statement regarding A

C{H_3} - C \equiv CH + {H_2}OA

Kharasch effect is based on