Q.

Which one of the following molecule contains a chiral centre

Moderate

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4-methyl-pent-2-yne

4-methyl-pent-1-yne

3-methyl-pent-1-yne

3,3-dimethyl-but-1-yne

answer is C.

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Detailed Solution

Total number of alkynes (structural and stereo) = 8 ;Number of structurally isomeric alkynes = 7 ;Number of structurally isomeric terminal alkynes = 4 ;Number of structurally isomeric non terminal (internal) alkynes = 3 ;Number of structurally isomeric straight chain alkynes = 3 ;Number of structurally isomeric branched chain alkynes = 4 ;Number of stereo isomers (alkynes only) = 2 ;Number of enantiomeric pairs (alkynes only) = 1 ;Number of structurally isomeric straight chain hexynes = 3 ;Number of structurally isomeric branched chain pentynes = 3 ;Number of structurally isomeric branched chain butynes = 1 ;*3-methyl-pent-1-yne has dextro and laevo forms

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