Cembrene, a C_25H_32 hydrocarbon, has a UV 2_max = 240 mm Exhaustive addition of

Question

Cembrene, a C_25H_32 hydrocarbon, has a UV 2_max = 240 mm Exhaustive addition of hydrogen (Pd catalyst) gives 4-isopropyl-1.7. 11-trimethylcydotetraderane Ozonolysis of cembrene with a Zn dust workup yields equimolar amounts of CH_3COCH_3CH_2CHO CH_3COCHO CH_3CoCH_2CH_2CH[CH(CH_3)_3]CHO CH_2(CHO)_2 Which of the following structures below is a plausible structure for cembrene (double bond configurations are not specified)? The H-bonded base pair shown on the right represents which of the following? a. adenine-thymine b. guanine-cytosine c- adenine-cytosine d adenine-guanine

Explanation / Answer

Q1) Option A

From UV we anow it has conjugation.

From the ozonolysis fragmentation we can identify the structure as A.

Q2)IN DNA guanine is paired with cytosine and adenine is paired with thymine.

In the gien pair one structure is guanine and the other is cytosine.

Cytosine is a pyrimidine derivative and guanine isa purine base.

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